Doesn't look like ai so maybe they paid an artist

Nope, I saw plenty of bad art before AI became a thing and this is 100% handmade. Not 100% original though, as the lines were clearly traced. You can actually tell the person who made it is fairly inexperienced in art because they used the airbrush for every single shadow and highlight, so being this anatomically correct on the lines would not be consistent if they weren't tracing.