Texture Practice

I've always wanted to experiment with different styles of coloring and 'painting' in Photoshop. Other styles, that is, aside from brush-based painting. I found this awesome tutorial about how to make shape and texture based paintings, and did a short test on a very simple sketch.

Here's the result. I'm going to add in some more elements, but I need to get more comfortable manipulating the masking in PS before I continue. Gotta find some more tuts!