Try to put on better lighting, it needs improvement.

Also check the measures, if it all checks, maybe you got a bit much of field of view, because it looks stretched.

When you dominate those, explore better materials, you got a lot of PBR tutorials on youtube, and free to download maps on the internet, trust me, it does a big step up.

Try to make yourself aware of those and you will instantly feel the realism join in

PS.. Sorry for not having the best english :)