Yo
I wasn't going to post a review..
What you did here looks nice, a lot of background detail too.
The real reason why I'm writing this is because of flyingmonkey456 said..
"Her lower back looks like she's leaning far forward because of the angle of the line on it but she isn't any shorter."
No. Have you ever considered that she's flexible or is twisting her body(which would explain why the left bra is showing & why the right shoulder is lower than the left)? It actually makes sense when you try to understand it.
"if you cover everything except the arm pulling on the bikini and it's shoulder and ignoring the hand, it looks like a right arm rather than a left arm."
Is it covered up in the picture? no. So if it only looks like that when you cover it up, and it's NOT covered up in the picture.... seriously...?