The vectors are clean. It's certainly a plus factor that you did cloud overlays and stuff to it. The clouds look realistic. It must have taken you a lot of time.
As much as I like your concept, the placing of the girl in a cloud without even bending a little seems awkward. All your colors have a very light earthish tone so the darkness of some parts of her earring is distracting.
Overall, this wall generates Nimya's character well. I like it. Good job.