Much of it has the same look. You do not have the variety you get when people develop their own styles. Also, can AI learn?
Yes, that's literally how AI works. It's nothing BUT learning. It's basically how the human brain operates but on a much, much simpler level.
If someone wants to have a picture of Krystal the blue vixen can AI look it up on the Internet?
Nope, you have to go out of your way to feed it manually. You wouldn't want an AI to train off of unmoderated datasets anyways because a picture of a cucumber could be labelled "Krystal Fox" and all of a sudden your pictures are green and elongated.
If so then which images will it use?
Whatever pictures you want it to use.
Images that are the property of someone else?
I mean Krystal Fox is an owned IP, the vast majority of Krystal Fox images are in fact copyright infringement to begin with, and 'learning via looking at' is not copyright infringement in and of itself. You and I could draw Krystal Fox with some practice but the mere ability to do so is not illegal....Ehrm....Yet at least, that seems in the interests of big corporations.
Can anyone using AI claim the art as his own?
Depends on the country but it's possible yeah, and frankly it's going to get a lot more common.
I've seen terrific images but are they those of the artist?
AI art images are belonging to whoever prompted them as much as a photograph belongs to a photographer who set up all the lenses, shutter speeds, angles and color corrections.
Yeah in theory an AI art generator can do that shit automatically, so can a camera. But both requires someone to actually set it all up in the first place and that's the artist.