This is the point where image generation gets squicky - not-for-profit fan art is one thing, but straight up copping someone's style to make money just seems like taking things a bit far.

I guess it's OK, though. They did say it was an "homage" in the FAQ.

Hey, guys? An homage is a one-off piece done to show an appreciation for another's work. Whoever you are, you're straight up stealing a look for profit.