I'm going to make this one brief. I've been noticing several pics on DA that imply that Luna had a happy childhood. This is definitely one of them, and I take a personal liking to this interpretation.
The facial expression itself is quite adorable (without being overly effusive), the three dimensional proportions (such as the folding sheets an the head) remain believable, and the star and crescent moon designs are arranged very nicely and dynamically. Good work.