>> What's not clear at all is what kind of "human hand" counts.
A literal monkey, who paints, has no copyright. The use of human hand is quite literal in the courts eyes it seems. The language of the law is its own thing.
>> What if I prompt it dozens of times, iteratively, to refine its output?
The portion of the work that would be yours would be the input. The product, unless you transform it with your own hand, is not copyrightable.
>> What if I use Photoshop generative AI as part of my workflow?
You get into the fun of "transformative" ... along the same lines as "fair use".
What if I prompt it dozens of times, iteratively, to refine its output?
What if I use Photoshop generative AI as part of my workflow?
What about my sketch-influenced drawing of a Pelican in a fancy hat here? https://fedi.simonwillison.net/@simon/111489351875265358