>>108365956I just throw a ref sheet and at least one other full body image at chatgpt with the instruction to create a realistic cosplay photo. for muyu I got lucky and it was enough to go "The attached images depict the vtuber Muu Muyu from Phase Connect. Generate a picture of a realistic photo of someone cosplaying this character. She is a cow/calfie vtuber with an alchemy theme, so give her an appropriate background and pose."
Sometimes it goes fucking stupid and gives them huge eyes and makes their hair and clothes look like they're still drawn, so you gotta specify to make their face, hair, and clothes realistic and 3d with proper lighting or you end up wasting attempts.