I can tell that's definitely V4's feet, at least partially.  They're excessively long, excessively thin for how huge they are, they have her ankle/foot behavior at the heel and (as seen in the left leg) in front, and her kind of bizarrely flat and extreme toe bend, as well as that excessively flat front that makes a triangle shadow (as seen on the right foot).  Both feet and her left shin have V4's very distinctive shape.  Which isn't to say photos aren't involved, but it definitely has a lot of V4's features.  And the skirt seems to be defying gravity- it's round around the legs rather than falling against the chair.  Her hands have V4's distinctive shape, and the bikini top doesn't seem to be shading like real lycra at all.  The torso is twisted kind of oddly, and seems to be a tad more distorted than a real person's body would be.  Her shoulders and arms looke pretty undefined and rounded for the size of their muscles like V4's, with V4's proportions in the shoulders.  It's amazing and excellent work, and I'm definitely not saying photos or postwork weren't involved.  I am immensely impressed by the artist.  But I can see a whole lot of V4 specifically and 3d in general involved with the figure.  Is it possible to contact the artist?

Oh, and here's another foot morph foor V4, though it's not free:

http://www.renderosity.com/mod/bcs/v4-pretty-feet-fix/86492