It is my first attempt to write a critique, so please, dont throw rocks at me.
I really love dark style of this drawing. It can be used somewhere in animation, or even a game. Because it is so minimalistic, it is hard for me to say anything more that that fact, that perspective looks good and totally right.
Maybe you could use less darkness on the sides of this drawing. I have this strange feeling that its unfinished. And texture of this cave looks so rought, that it feels kind of strange for those stairs to look so polished.
I love the depth and perspective of these. The use of the cool color of the rocks and the warm light coming from the back really pull you in. Good use of color. I would suggest to watch your values though. If you desaturated your picture you can see most of the colors are the same value. If you you put a good mix of light and dark values I'm sure it would pop even more. :3