1, open the material picture in ps, and the circled arm needs to be adjusted, as shown below.
2. Circle the arm and the surrounding environment with the lasso tool, as shown in the figure below.
3. Right-click, select Feather, and set the Feather Radius to 20 pixels.
4. Press Ctrl+J to copy the layer and get the layer 1. Press Ctrl+T to transform freely.
5. Right-click to select deformation, and press and hold the left mouse button to gently push forward.
6. Merge the layers and execute the filter liquefaction command.
7. Use the forward deformation tool at the upper arm muscle and push it to the left.
8, after the completion of the effect.