Use the eye dropper tool to sample the darkest green color, then paint the four corners with a little grunge in that color.

使用滴管工具的眼睛最黑暗的抽样绿色，然后画的四个角落的小垃圾在这颜色。

youdao

That latter tool, the Advanced Healing Brush, lets you paint in corrections, rather than using the round dropper to make tweaks.

ENGADGET