2. Deepen the color around the selection with a brush to make the color of the selected part more prominent.
3. Repair the other side in the same way as in the second step.
4. It is the same to deal with the side in the second step.
5, the treatment of the inner surface, add gradient, stroke and fill white.
6. Finally, select the selection area and slowly draw the effect with a brush to make it three-dimensional and real.