I'd say it's not "fake", not illegal, but unless he paid for the use of that image, dangerously close to it, and he probably knows it too that's why he mirrored the image... :)
He changed the feet a bit, he changed the dress, he added a bunch of stuff (although who knows all those other props could be googled photos as well). He went through some hard work tracing the image, and adding the mesh inside the racket, and applying paint, although some of the paint could simply be the photos blurred and smudged... yeah it's hard to say exactly, without a video of the process, but this one's probably not super bad. :)