One thing lending me to think this is a real guy is that, aside from @hypothetically affirming he is a real guy, the private pictures which are fairly revealing. While they don't really show his face, there seems to me to be enough showing that correlates with the public pictures to say they are probably the same person. Often the true scam artists have stolen pictures from Instagram or Twitter and have no revealing shots.
Of course it's not impossible that a scam artist could find some nudes of someone with a passable (non-facial) resemblance to public pictures that they've found or even public pictures and nudes of the same model. It's also not impossible that the pictures are all of the guy advertising, but the guy is still a scammer of some type. After all we've all seen cases of scammers using their own pictures along with fake reviews.
I'm going to hope however that the guy is real, lives up to his ad, and that @Sagittarius has a great time.
I guess it's just part of human perversity that even though this will be his first time and he's nervous about it, he can't bring himself to find an escort that's more of a known quantity. I was lucky that the first guy I picked -and it was my first sexual experience as I hadn't even French kissed anyone before that-truly was an experienced escort whose ad and personal website I had seen for years before hiring. And who was nice enough to take the time to be gentle with and show the ropes (figuratively -as I'm vanilla and not into kink) to a total virgin.
Gman