Definitely not too bad on the materials, particularly the tile and granite. Lighting needs work though. I haven’t seen a sink that square in a long time either, so that may be a good thing to improve upon later. In addition, is that in the back supposed to be a painting, or a window?
In particular, I think you should experiment with lighting as it’s quite a crucial component in attaining a superior result, and can help you in finding what needs work and improving on it.
1: The big water blob of death? I have no idea what that is. Maybe a few more samples can help or move that somewhere where it can be seen better.
2: You seem to be having some weird reflections here. Probably because of the geometry.
3: No interest. It’s all dark. Add an exterior image or something that can keep the eye interested.
Hope that didn’t sound too harsh, it’s meant to help and good luck!
This looks nice, good work! I like how you managed the materials, and I think the second render looks great.
You should try to use bevel edges on the sink, it might look more natural.