Reverse the painting
I’ve found that after painting for a while, sometimes I start to lose the freshness to the figure. When that happens I flip the figure horizontally, and see if everything is anatomically correct, or simply looking right. This step is essential if you’re painting a figure fullfrontal. The pre-defined shortcut in Photoshop is Ctrl/Cmd+T>rightclick>Flip Horizontal, but you could always define a hot key for this.