Again, content is great! Love the background setting. Lighting was perfect and Kahli at least looks like this is a somewhat natural pose. I've noticed that she tends to part her lips in a lot of shots. In many of them, it doesn't really look right. This one, though, is spot on. The wisp of hair framing her left breast tends to draw the eye to the bikini top (her left breast covered by the bikini) and so would be an awesome subliminal draw to the bikini if that is what you are going for.
As a practiced anatomist I must disagree; visible ribs are definitely not a sign of malnutrition or eating disorders! You can take my word for it, this young woman is quite healthy; and I also observe that she is sensible enough to avoid tanning!