MLC is right, I tried to make an edit to reflect the true nature of a sealed off dark cave:
In all seriousness, it's looking good. I like the max contrast edit, I think it makes the thing look vibrant and interesting. I love the rock tiles, but maybe you went a little overboard with the stalactites. Also, I don't think the dwarf fits very well. He is more of a cartoon style, with all the lines and clean surfaces, and the rest is very gritty and real looking, with detailed complex surfaces.