Not quite sure what I'm looking at but it intreages me! The snailing creature with the mouth that looks like a door and the chair. It doesn't make sense really yet I feel that I want to know and I keep coming up with different scenarios. As I said, intreaging.

I like the colorpalette of the piece, and for some reason it feels to me to be under water and I almost get a spongebub vibe. Not sure the latter was what you were going for but this is like a darker more edgy variant. Like Spongebob the nightmare...

To give you some critique the shading in some places variies a bit, for instance on the barnacles of the shell but it's no mayor issue. The one second from the bottom could have gotten some more light I guess. Next the perspective of the chair seems a bit off. The leg further away from us is a bit thinner than the leg closes to us and seems to be a bit too far away to fit with the area where you sit. Also, I get that you have worked with a one point perspective but I think you might have overdone it a little on the chair, but it's such a small fault that I am nitpicking at this point. Still though these points movitate my 4/5.

Overall an interesting piece. Well done.