I love how a few splatters of the star paint has fallen to earth and created little splashes of white. The way the girl is sitting is great, but it looks like she would fall into the bucket; she looks like she's floating. Also, I think her hands are just a tad bit too small. But overall it's beautiful and I love the way you colored the darker bits of sky and the clouds.
It's very interesting, if I may relate, because I did something similar a few days ago. Not the painting itself, but what she is doing. I live in the closet of an attic with 2 very small windows that are now covered up. So I barely see sunlight, especially when I'm not in school or it's winter. I've been sick the past week and haven't really left my bed, but I did get this burst of energy for a moment a few days ago and while I was cleaning my closet/room, I found glow in the dark stars. I put them up in my favorite constellations in my room, so now there's actually SOME light in my closet (used to be pitch black).
This is very creative I love the balance in colors and the textures of both the sky and the moon. The stars, her hair and the small drops of paint on the ground, they are connect so good with each other and the shading is just terrific.