Have you trained as an artist? It’s very different from what LLMs are. If you’re good enough, you can reproduce any style, but people try not to because it’s obvious. And more importantly, you avoid copying ideas and presentation.

But the most glaring issue is attribution. You can avoid paying, but not doing attributions is my pet peeve. Even when doing fanart, fanfics, and parodies, most people take care to mention where their inspiration comes from.