Hello!What a beautiful drawing you have! A very solid piece, but I have a few pointers to help you along. The first thing I noticed was the lighter, blurred section in the hair. I'm guessing you were going for a more subtle highlight, but it doesn't com across that way. The best thing to figure out first is where the light source is, and go for a lighter color with the pen tool on certain parts of the hair instead of airbrush(?) across the middle.Another thing I spot is how far apart the eyes are. As rule of thumb, the eyes are exactly an eye width apart. The brows should also be closer to the hair line, right on the brow ridge, this seems as though they are part of the eyelid. The nose should also be more shadow, the lines being only the nostril outline.The lines through the hair also give it a rather messy appearance, another good rule is 'less is more'. Don't be afraid to go for big, bold strokes instead of several small ones.Over all, I love the colors and the shape of the face, very symmetrical and elegant. Good job, keep it up!