your hard work has paid off, this piece looks like it was a huge educational experience.
i really like the tired meat sacks under his eyes. the hair is amazing. if you just sit back and look at it non-critically, it is simply amazing. i love his careful expression. the glamor blur is an interesting contrast in subject. makes me think of dorothy from the wizard of oz movie. it makes it look much more real.
critically, i think the brow could use more accurate skin folds
brow frown lines
and i hate starwars! why won't it just go away!? =p .. but i love what you have created here, nicely done.