i love doing this type of work. in advertising we (us artists) would have to do touch-ups like this all the time. a model's face would be tweaked so much... and then it would get to the point where you could just tell you went one step too far haha.
this looks great. the smoothing of the skin is very natural. you retained the character of her face, but removed the blotches. it seems like the teeth are a little too white and i'm not sure i would have sharpened the mouth that much, because your eye notices the model's eyes first, then the piercing, then the mouth... so you kind of trail off out of the frame. you want to keep the attention on the eyes imho. great job though. i think its harder to tweak b&w.