This is one of those pieces you see and admire for it's minimalism and how it allows you to fill in the blanks. The abstraction elements are astonishing and the colors picked are amazing.
With that said, my only nitpick would be to watch the proportions of the features of the face, but it's such a small nitpick when compared to the awesomeness of the whole that, well, doesn't really affect the piece in any way.
Also, the style is also so unique to you that it's amazing. When I saw it on the front page I already knew who had painted it. I absolutely love the expression and the colors. Definitely one of the most talented artists I've ever seen on DA.