I agree with the first point upstairs. Liquefaction will make your face thinner ... Menu bar-Filter-Liquefaction (shortcut key shift+ctrl+X). First, freeze around the parts to be thinned with a freezing tool, and then thin the face with a forward tool. Front: Back: Besides, does changing the background mean changing the background of the character? Upstairs is the shortcut key for filling ................. ……alt+del is the shortcut key for filling foreground color, and ctrl+del is the shortcut key for filling background color. If you want to change the background, you need to use the matting technique ... first, use the matting method to cut out what you want, then use the mobile tool to drag the matting directly onto the photo to be synthesized, then ctrl+t enters the free transformation, and hold down shift while dragging the corner handle to adjust the size. Ctrl+m adjust the curve, adjust the opacity according to the situation, or feather the edges to make the blending more natural ... Here are some tutorials on matting, which I hope will help you, o(∩_∩)o.../jc/search.asp? CP = 0 & getkey = matting