While there's no way to report individual profiles, I believe you can just report the games in question with the offending art and add a comment to the report with your concerns for the admins to read over!
Viewing post in How to report a person instead of a game page?
And what about my question about this:
https://itch.io/t/2192623/why-does-reporting-someone-require-me-to-input-my-emai...
I just don't feel like actually confident typing in my email address on a game page like that, and won't do it until at least a mod confirms that I shouldn't worry about it.
I'd assume that the email is only shared if it's something like a copyright thing where they'd need to legally inform the other party that someone is claiming a DMCA against them, so they could take the necessary action if need be. But I getcha--and hopefully someone can clarify more officially, just to be sure!