Example steps are as follows:
1. First, open two prepared characters in Potoshop, as shown in the figure.
2. In the document of Figure 1, select "Rectangular Box Selection Tool" to frame the portrait, and press "Ctrl+C" to copy it.
3. Switch to the document in Figure 2 and press the shortcut key "Ctrl+V" to paste.
4. Select the layer 1 to reduce the opacity to 50%. Enlarge the head of the character at will and put it in the approximate position, as shown in the figure below.
5. Add "layer mask", select the black brush tool, reduce the hardness to "0", and slowly erase the unnecessary parts of the face.
6. at this time, the color of the face is very different. Curves can be used to adjust the red, green and blue channels separately.
7. Finally, use the brush tool to make minor adjustments.