C&C per req:
1. Interesting pose; I'm undecided on the guitar as a prop. I do think the image needs more light on the hair/hat as there's very little visible detail in either. As far as composition goes, I think not cropping the the side of the guitar image left would have made it better. For shoots like this, try and get more separation between subject and background and use a kicker to blow out the detail, and don't forget to clone out the strobe visible in her glasses. It looks like you may have overdone the skin-smoothing as well.
2. Holy tungsten WB Batman! Just a little tooo blue for my taste. If this was an intended effect, fine, if not, back to the pixel room for a WB adjustment. It's nice that you can see her eyes behind the glasses ('though I would prefer them to be gone altogether) but remember to clean them and again, clone out the strobe flash. As with #1, there's very little detail in her hair. She obviously has very black hair and this is difficult to work with from an exposure point of view, but additional, careful lighting will help. I think also more care in the positioning of her hair would have helped. Once she's laying down, use a course comb to fan it out evenly perhaps.
Just my $00.02 worth - your mileage may vary.
~John