She is lovely for a first try.  The only thing I would say is your white is too white I see you did some stars that are greyer, but your white is a bit too bright and makes her look more spotty then stary.  Also I think what is making her look that way is how round your "stars" are.  If you made them to have a few different shapes they would look less like an Appaloosa pattern gone array and more like the star field you are going for.  I do think your body paint work is super and love the hair color choices.