Nice idea, but also needs work to be effective.

I really like the bend of the girl's body - it really works. Her position is actually good too - the composition in general feels proper.

However, you've made three main mistakes that, if corrected, would improve the feel of your work.
- Color scheme: good, except - when you use too much of the same color, it looses its power. You color of choice is pink/red - warm color scheme; it is present in a overwhelming amount - and yet, it's still not as effective as it could be. However - you've added some green - as a hint of the cool color scheme, it contrasts the warm colors, emphasizes them, makes them more vibrant. Blue, or even a deep purple would do the same. So it might have been good to reiterate the green in other parts of your drawing - perhaps as the leaves of the cherry tree; (The yellow chosen for the sky is very pretty, but is too similar to the girl's skin tone - and thus acts as a distraction).
- you've put a lot of details into the tree, the girl - and worked very little on the sky. It's a contrast of technique - one reveal effort; the other - lack of planning; In the future, use your background to move the audience's eye throughout the drawing; clouds can be your great helpers - same with any layers of the sky. They can be positioned in such a way as to complete the composition, either give the falling girl a feeling of speed or suspension...
- finally - the flora of your cherry tree is so perfect in shape, it's a bit too perfect, too linear... A bit more texture next to the trunk would make it more interesting.

Hm. I'm sorry for being so analytical, so detailed in my explanations. Lol