It’s pretty good! However, you should try to play with the texture or decals a bit more. Example, for your fan on the ceiling, you could set the material to glass and change the transparency to 0.5, it gives a really good realistic metal, however, this is all personal, if you want more info, this link will probably help you : https://devforum.roblox.com/t/how-to-get-a-reflective-surface/491868/5.
For the floor, try to create your own floor with blocks instead of a texture, it’s all small things like that which will improve your game. Maybe considering using blender, it seems hard to use, but it’s not and you can learn pretty fast and it could greatly improve you game. To improve your lightning, here’s a link for it : > https://www.youtube.com/watch?v=F952IBG_2OY
There is more methods to improve the lightning, but that’s a good start, the best thing is to look up at all the objects you can create in the lightning, like BlurEffect, BloomEffect, etc. Then, go in the propreties of each and change all their values, one by one and see what look the best for your game. Hope it helped!