I absolutely love this concept. I would buy this if I had money, not in its current state but the soon to be finished product. One thing that i think could be improved is the emoticon bubble. Is there anyway the character can express that through body language instead of having a white bubble marring the image?
Ideas would be her trying to cover up, pointing at him, or arms down and tight against the side on her toes in anger. I love that she isnt scared by the massive tree beast but is frustrated instead. So I would see if you cant keep that emotion in there.
A Cartoonist is just a lazy Animator.