The pics look airbrushed, so to give you a comparison, I'm kicking off with a GG escort from the same site.
Note 1. The photography is professional. The guy obviously has made a good living out of photographing nude women.
Note 2. The girls are heavily made up BEFORE the shoot. That's face make up, pro hair (or wig) AND full body make-up as required. Check out the body glow at the shoulders, nipple glisten etc.
Pro make-up + pro photography = no need for heavy airbrushing afterwards.
Mind you, with the level of work going into prepping each girl, I'd guess what she looks like in the flesh is quite, quite different!
Here's the GG. Going rate for a GG seems to be about $80 normal to $100 top end, per hour.