It’s not a copyright violation to commission an artist to make you something in the style of another artist and it’s also not copyright infringement for the artist you hired to look at that artist’s work to learn what that style means. And it’s also not always infringement to draw another artist’s work in your own style same as reimplementing code.
If you “trace” another artists work the hammer comes down though. For Copilot it’s way easier to get it to obviously trace.