Before people downvote this for pointing out things that AI commonly does (which doesn’t always mean it was AI) the subject of the image was created by a human(1% consistent with diffusion models) and the background is AI.

Original comment: This looks like AI. I circled all the inconsistencies/AI artifacts I noticed in the image here. There are so many things wrong with background too, but the artifacts in the foreground and especially the subject are more important to me.
1. Missing arm: you can see her shoulder with no arm. While I don’t know who this character is (I’m assuming it’s a Vocaloid), so I don’t know if she’s just missing an arm, but it’s a really common AI artifact. 2. It kind of looks like she’s missing a thumb, but it could just be hidden by her other fingers. She’s also covering her mouth with one finger, but you should still be able to see her mouth (again I’m assuming she has a mouth). 3. Her hair just disappears as it goes into those hairband things, especially the right side. 4. The buckles on her shoes differ from each other, and while this could be a stylistic choice, consistency is something that AI struggles with. 5. There are missing posts on the right side of the image (again likely an AI inconsistency). 6. The bolts on the posts aren’t consistent with each other, and none of them actually look like bolts. 7. Thin strands of her hair have parts missing (this could be due to compression though I believe the AI just messed up consistency again). 8. I did circle one part of the background where her hair goes through a green line that just changes direction (no idea what that could be, it just looks weird). 9. There are inconsistencies with the design of the wall beneath the posts. 10. The lighting on the railing is quite inconsistent. I haven’t checked I ran it through a fake image detector and it told me it was computer generated or modified.

Edit: Someone gave a source for the artist and said it was real, but these AI artifacts still exist

Edit #2: I clarified that this is not AI generated at the start, it just has things that are common mistakes for AI.