Your linework is really great, and I love her expression. Her hair does seem to be a lil "unstuck" from gravity... but if it wasn't, her face would be covered, and i'm glad it's not. Your grip on the human face is unfaltering. Great job.
it's so simple and beautiful. i love it! you even inspired me to get my butt in gear and do some realism of my own. i've got a sketch of johnny depp and one of keira knightley just waiting to be posted ^^ keep up te realism, they always turn out so lovely