Because of the relationship between shooting angle and clothes, MM's waist is slightly plump.
Find the filter in the PS menu bar → Liquefaction,
Click to open the liquefaction tool interface. We choose to use the forward deformation tool, and the parameters on the right default.
Then, move the mouse to the picture, and an icon of a brush will be displayed immediately. At this time, you can use the "forward deformation tool" to smear where the shape needs to be changed. In this example, we adjust and modify the waist.
As shown in the figure, we hold down the left mouse button and drag the brush to smear slowly along the arrow direction to improve the waist shape, tighten the waist inward and slim the waist.