definitely ! you should direct the pose a little bit better, especially if she's going to be sitting on the ground, and I don't know if this composition warrants for a head crop. 6
Lovely model. I love your exposure on this except for the area under her eye on the lit side of her face - there are just some shadows there that seem to pull her expression down. I think I would have reduced that shadowing there.
She really is beautiful. I think the crop is a little too tight at the bottom, I'm undecided as to if it would have been better to not cut off the top of her head or not. I like the way you lit this though.
GRRRR. Great lighting and like the conversion to B&W, lovely shadows. I am jealous (of your photograpic talent, not the girl as I am married to a wonderful lady...)