I really like the composition and colors. The only thing I notice on this piece, that bothers me, is that her ears seem to be a bit...too angular. There should perhaps be a little more "fuzziness" around the edges, to give them a little more depth/definition. I love the water effect with the little leaves growing out of it!
I think sometimes people are some eager to prove they're good artists by picking out every little flaw that they miss the beauty of the "big picture". WHO CARES if certain parts are a wee bit off. It's beautiful. What people should be asking in regards to ANY art piece is this... "How does this make me FEEL?" a more positive approach I think. Obviously you do this a lot... you'll get better without me dragging you into the fire... so to speak. Keep them coming.
The sleeve is a piece of art itself, but the torso looks strange. It just does not look "ok" with the arm position. The bubble looks like a soft lace, and the keys! What kind of misteries do they unlock?