Slimming is easy to do in PS, but it takes a little patience to carefully tick off the parts that need to be modified.

The first method: tick off the selection and use the deformation tool to deform, but there is a problem, which may not look real.

The second way: there is another stupid way, tick off the constituency and cut off all the unnecessary parts, such as fat arm roots, lifebuoy-like meat on the waist and protruding cheeks. The steps are as follows.

1. Draw an ideal picture with strokes first, and of course don't tick off the unwanted parts.

2. Use shift+ctrl+I to select the dashed line in reverse, and then "delete" the unnecessary part, and then start thinning.

3. Reverse the dotted line shift+ctrl+I feathering twice.

4. Draw the face with the color of the face and the arm with the color of the arm. For accuracy, you can use the pipette tool. If you are coloring clothes, you can suck the color of clothes.

5. This basically completes the complementary color, and then continues to refine.

6. In order to see the modification effect more clearly when thinning, you can hide the dotted line ctrl+H first, and never press D, so you need this option.

You can choose all kinds of tools you like, such as pen, brush, stamp, daub and blacken. These tools are very suitable for refining, and your artistic skills are useful at this time.

The third method: use the liquefaction tool in PS filter options. Tighten and lengthen the parts to be adjusted.