Depends what you aim for. While not every bathroom has a window having some directional light can add help with realism. You can mimic the same with HDRI but you need one light which is more bright than the others.
It looks a bit dull right now because the bottles etc almost have no reflection. The wall is also a really rough surface while that’s not the most practical surface in a bathroom to clean. So it would be more like gloss like paint you can clean easy.
The towels also give it a really rendered look instead of realistic. The field of view is also really narrow I think so you lack a bit of perspective which would make it more natural.
I personally like renders like these because they look more like some illustration which can be cool. But if you aim for realism there has to happen more in a scene in reflections/light
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Here are my thoughts on how to make the rendering more realistic and I may repeat what @oscar.rottink has already said, because I totally agree with him:
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I would try to use another material for the wall, maybe even tiles. The current one has too much repetition and it almost looks like a wallpaper, which you’d never use in a bathroom due to humidity. Will Gibbons has a very nice tile tutorial on Youtube.
https://www.youtube.com/watch?v=pM7HytgNV2g -
The towel models need more refinement: the seem very thick, UV unwrapping is not that great and maybe I am wrong, but they seem small compared to the towel which is hanging down.
They are also aligned and rolled up to perfectly - turn one or two; rigg them if you can do that. -
The bottles and plants: they look “too” perfect and even. Add some scratches, more reflection, color gradient, manufacturing defects, … you name it.
Especially the green plant doesn’t look that realistic, because it’s only one even color.
How about this model:
https://polyhaven.com/a/potted_plant_04 -
Add some more products right next to the sink: soap, brush, tissues, toothpaste, …
Also what is missing for me: a mirror.
Maybe I am wrong, but for me the overall composition of the scene is a little off, like having two hangers next to each other at head level; the opening in the wall behind of the table, which you would usually make next to a bathtub.
What I also really like and makes it more realistic in my opinion, if you add a window (off scene) and the light shines onto the wall/products: it creates a nice contrast and makes the rendering more alive.
Maybe you can also try to add some other colors. Right now everything has the same tone, but a nice color contrast would help.
Apart from that, I agree with @oscar.rottink that reflection makes a huge difference and highly recommend to add some, especially the sink, which often has a shiny ceramic finish.
Good luck and looking forward to seeing an update of your rendering.
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I agree with the others, but would like to add that the hanging towel also looks a bit off when the lower edges are completely straight. Makes it look pretty unrealistic. I know that modelling fabric can be a hassle, especially in a CAD-software, but I think that it should be pretty straight forward to make something like that in Blender with a simulation.
Now, I’m not used to working in Blender, but if I’m not completely mistaken you should be able to just model the ring and a flat towel (laying horizontally) and place the towel through the ring. Then use the cloth simulation on it and have it fall down and settle in a more realistic position over the ring, with the ring being stationary. Shouldn’t take too long but it will probably give you significantly better results.
If you’re familiar with Blender or willing to put some time into learning it you could definitely make realistic rolled-up towels with it as well.
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I definitely second all the comments made here as those would all be great improvements to the scene. From my perspective, I think all your edges are way too sharp. Like the cut in on your wall, it will never has such a perfect 90 degree angle and can definitely use some degree of bevel on those edges. Your table’s edge is look pretty good, but the wall is a bit too sharp. I find a major giveaway that renders are computer generated when the edges are perfect angled corners which don’t happen in real life. I would suggest adding corner rounding, but the effect is pretty subtle. If you can bring the scene into a modeling software, adding an actual bevel to the edges will give much better results.
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I would second the comment on the image looking too perfect. Just by playing with the material graph you can probably add a subtle map to the preexisting wall texture to make it seem slighly rough in areas and smooth in other areas. The same can be done with a few of the other materials. Also the plants and towels are a huge give away. Make each towel roll slighly different.
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I wonder where you get the seamless wall texture as there are lot wall textures that you can see the repetition when you apply it to the model.
Seamless doesn’t mean without repetition. It’s without seams so you can put them next to each other and the shape will continue on next tile. But if you just have a texture which will cover the few m2 in your picture than you won’t have repetition and you don’t need a seamless texture.
And you can also just add a label on a wall with seamless tiles with a bit of roughness difference or a different texture so you ‘break’ the repetition.
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I’ve known what you mean, thanks!
Something I forgot, if you have a pretty small scene like this it can also help to just put the texture at an angle like 30 degrees that will make the repetition less obvious since all lines are horizontal/vertical in your scene. Of course, if you have a texture of a really small surface and you need it 10x on this surface you will notice but for 2-3 times could work pretty ok to give it an angle.
Here is my new rendering, being my cpu and gpu is not so good, it is really not so easy to make some changes. I hope my boss knows how difficult my situation is, hahahahahaha
Try to convince your boss a nice 4090 is a great investment since you can render so much faster, try more which will result in better renders and more sales 
If you use such textures I always look for really high resolution images. But also which cover like 4x4 metres so you have a large surface in a texture. Of course you need an even higher amount of pixels but you could cover the entire surface with only 1-2 repetitions.
There are also companies who sell textures like Arroways which have all the real measurements under their textures. So you have a nice idea on what the actual scale is. Wish more companies did it, saves guessing.
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