Overall I like this SG. But the right arm missing bothers me a bit. While you can assume it's behind her doing something (the wedgie idea is cute) I would frankenstein her left arm and mirror it and paste it in as the right, maybe change it a bit. And the BG does need something I think, maybe a plane or a bird or even a frog? Oh, wrong reference. Sorry.
This a great picture. Since she has a very small top (which is nice), I would have gone with a shorter skirt and trim them down to make them hip huggers; or...given her some daisey duke shorts.