I actually covered this exact point:

If they take suggestion from someone else, like an employer, then a contract and shared creative ownership can be argued, but that is something between two sentient life forms.

When two sentient life forms collaborate to create art, then they share the ownership. When an employer tells me what photographs to take, they have a part in the creative process and have placed their intent into the work. Now, 99% of the time, when an employer asks for something, and I do the work, they don't take the credit for it. They defer to me and understand that my knowledge has given their idea form, and because of my intent, their intent has been realised. However, there can be arguments made for shared ownership if they have given me input as to what they want. I'll even praise someone who has done some research beforehand and said something like, "When I was here last week, at 4pm, the sun shone through here beautifully, and we'd like to get some photos with that." That is a shared creative experience, and the intent of both parties creates the art, and so both parties have some ownership. You can also look at this through the lens of the music industry, where a performer may not write their own songs, and both the artist and the songwriter share credit for the song (though usually not equally).

Now, when I give instructions to an AI on what art I would like to see, that AI has no input in the process, it simply pulls from its dataset and applies a randomly generated seed to create the image. It exerts no will of its own, and so no intent of its own is wielded over the art, as it has neither. It is no more willful than the grain of the pencil lead.