1, first open the PS software on the computer, and then open the picture to be processed in the PS.

2. Next, press the shortcut key "Ctrl+j" to copy the background layer, and the subsequent operations will be carried out on the copied layer.

3. Next, select Filter-Liquefaction in the toolbar above.

4. Then change the brush to the appropriate size in the dialog box, and then daub it with the left mouse button in the picture.