I really like the thumbnail of that piece. Zoomed in, I can tell you sticked to basic brushes; which is good. I'd like you to try a square brush though, because I think it would fit in with your style a lot better.
Fantastic Mark making. Is it just an assortment of brushes that gives you that textural quality to your pictures? I also see its probably due to your sense of color, tone, tints and shades that make your work Great.