First I wanna say that I love realistic drawings of pokemon so I really do like that persian of yours.
I have to say, that I always thought of persian as a normal cat, but well, why shouldn't it be a puma? I like the pose and the shading, but the lines look a little bit too much like a mere sketch, especially at persians back & tail. Nevertheless great job : )
Big cat is definitely the way to go with realistic persian. Puma? I dunno. I think a female lion. Except the male and the female persian would be like the female lion. In the way that they don't have manes.
I feel like Persians should be kind of elegant like big cats, but a lot of people draw them cute like kittens. While this isn't necessarily as elegant as I'm looking for, at least it's not a kitten. But, putting all of that aside, it's very well done. *thumbs up*