Thanks for the critique! Crispness is something I'm trying to improve on in my work, since I think I'm more inclined to throw pixels (and lines, and colors) around messily by habit. 

 The strands coming together at the top the way they do, is a bit odd. There is a cluster of dark pixels there, and that area is then reinforced with a dark line. I also feel that this piece kinda falls short, it has the potential to be that little bit more crisp and clean. Good job though :)