As I readed this was your second job with digital art and I must say that it is impressive The wall, with that deep night sky and the star stickers, looks beautiful and has some neat spots with no clouds that help the observer to "relax" the eye (if you know what I mean).
I like how you painted the stars, (rounded and cute ) with a soft color and texture, but I miss sparks inside some of them! maybe it would be a good idea to give to the biggest ones more intense yellow or white color.
The floor totally looks like wood, good job with that But why is the moon as big as the stars?
Another thing I like is the hair of the lady and her pose ^^
Finally I must say that I love pictures with little white dots all around it and somehow you include it in the wall, but some of the dots (in the top of the picture) are too big for me, they don't look "realistic" and confuse me.
Keep the good work and you will improve your digital art skills quickly!