The face down ass in the air knocked out girl is very erotic. The arms just flopped on the ground to punctuate the fact that the girl is totally out cold.

I remember a few years ago seeing a photo of a female boxer knocked out on the canvas in the same position. It may very well have been posed, but it was very arousing!!

Perhaps a slight improvement would be to depict the girl in the same position, but with the gusset of her panties pulled in tight, or even displaced sideways in the fall to the canvas. The display of her most intimate parts while she was out, would suggest her vulnerability and her helplessness.