The principle is to crop the face to be replaced and place it in the relative position of the face in the target photo, then add clothes, hair, and background to the face.

Finally, you can perform 4K HD restoration and enlargement: https://www.runninghub.cn/ai detail/1906435334542905346 to obtain 4K photos with ultimate details.

The replacement effect works better for portrait photography. For faces that are very small, the face-swapping effect will be less effective. If there are specific questions, you can contact me in the runninghub group.