Great pic, all around. I'm loving the colors and the shading. And the background is stellar! The plane and contrail detail is particularly nice.
One piece of constructive criticism for future works: Her neck/head seem a little too far back; even with considering how far out her chest is sticking and the arch in her back. Centering the head slightly (very slightly) to the left could make her posture more natural-looking.
Great work either way!