I can see where an open-leg pose could work, but I don't think this one does. There's definitely 'attitude' there, but it doesn't come across as a positive attitude - e.g. a defiant attitude or even a devil-may-care attitude. I think part of it comes from her having her left leg elevated like it is. If she was leaning back on both hands with her legs straight in front of her, that would reduce a lot of the 'sleaze' vibe I'm getting.
I also feel like the image isn't being helped by the shadow running along the crease between her left leg and her swimsuit's bottoms. It tends to suggest that there's more going on than you realize - or that you want.