If i had to guess, this used a real image as a basis. So makes sense that it looks unusually realistic.
Some go as far as tracing real images, and yes, there were people found out using actual CP for references. The Japanese immediately disowns them usually because of the whole "yes loli, no touch" mantra they have, while westerners either pretend they never heard that slogan, or claim the actual CP is just "recordings of a crime".