The litten "evo" is the only passable one but it resembles more of a panther than a tiger like most people are assuming with the markings on its head.
Rowlet looks like those dudes from Journey.
I thought it was weird that the markings on Litten's body would change so drastically. Hardly any on its legs anymore, some of its paws are red, no "whiskers", different marking on its head. Of course, the design thought behind that might be that when it sheds it fur via combustion, that it changes. Also, didn't like how it was oriented sideways.
I can see the design in Rowlet being base off of the description we have for it. Silent, uses kicks. The bowtie is still there.
And I can kinda see it in Popplio's too, but that's a bigger stretch. I could see it going bipedal because we see it stand up proudly on its tail in the trailers.
Overall, interesting ideas for designs. No doubt they're fake, but I can see the design decisions behind them.