If she's got her legs together and bent like that, and the string of the thong doesn't disappear into the crack of her ass, then no, Sir Mix-A-Lot would not approve at all.
Statement: Her thighs are together and her legs are 90-degree perpendicular to her body, yet not a single part of that thong disappears into the ass-crack.
Conclusion: There is no ass-crack.
Extrapolation: There is no ass.
Addendum: She needs to put some flesh on that bony thing.
Thank you. Can't even begin to tell you how often I have to remove the "huge_ass" tag from a very undeserving, Whopper w/cheese-starved female who simply has wide hips and/or thick thighs; No ASS.
I'd upload visual reference here on how to tell the difference but I can smell the butthurt now.