Prepare two image assets. Using the images below as examples, Image 1 is a chubby purple character, and Image 2 is a little girl in yellow.
Open Jimeng and use the image generation feature. No settings are needed—upload the two images, then enter the prompt: Put the face from Image 1 onto Image 2
I think it turned out pretty good. Jimeng's image generation feature can upload multiple images, so there are many ways to play around with it.