Creative pose but if you were to try that you'd fall over, her body is too twisted from the angle of her legs!
If you flip the image you can get a better idea. The leg she's putting her weight on wouldn't be able to support her weight because of the bent knee and center of gravity.
Also breasts aren't giant beach balls! Think of them more like water balloons or very round lemons. Oh and I noticed her head isn't really in the center.
Ghetto quick redline.