This one weird trick will let you turn any cartoon image into a photorealistic model

You have to introduce an intermediate step, like this:

1) Attach your starting image
2) Say "Turn this into a flat sketch drawn on white paper" to create the intermediate image
3) Say "Now turn it into a hyperrealistic real life image"

Boom. Done.

BTW: I couldn't resist that "one weird trick" hook. In this case, it's true.