This really does look like a photo a parent would take of their kid before sending them off to school ^^
I think my favorite part about this is the hair - more specifically, the strand of hair over her shoulder; hair drawn
like that always looks more flowing to me c: And, of course, her smile is really lovely.
Her head does look a bit big compared to the rest of her torso, though; you can try making the shoulders a bid wider to avoid that. But overall it's a lovely work that almost makes me want to try painting again (until I remember that I suck at it XD). Good work!