Nice painting. As for things that stand out to me, the lighting you seem to have chosen is coming from behind (setting sun I imagine?) but some parts of her do not seem to reflect (pardon the pun) this ie: her breasts, her right arm ( and lower parts of the arms which should be shielded by the wall behind), her right leg, and possibly her left ear and face section which should be shielded by her hair somewhat. You spent time rendering the fence behind but the wall looks half finished which kinda lets down the rest of the detailed work you did there.
Back on the lighting issue you chose a great time of the day for the piece and it would have been nice to use reflected lighting on her to tie her in better with the background you have used.
I actually like the pose, makes me think this is a snap shot of a scene & wonder what is actually going through her mind rather than thinking she is just "posing for the camera"
Great effort & look forward to seeing more from you.
I like the composition of the piece, but it's mostly the lighting I have some problems with. Since the source of light is the sun, the light shouldn't be so white on certain places like the skin. I would add a little splash of orange and yellow to make it pop more. Overall, I do like the piece.