Duplicate the model layer
Go to Filter -> Render -> Lighting effect: choose the spotlight, from right to left, use the narrow diameter (barely covers the model) and quite strong light intensity. The critical point is the texture channel: choose one color channel, then maximize the height to moutainous, so the skin will become "moutainous" looked like hairs full of the body.
Use eraser to clear the right part of the body, keep the "devil" part, use low opacity to fine tune the transition between 2 layers.
Create a new upper layer, full of dark red, then use the tool "Create clipping mask" and blend by the method "color", you will have the "devil part" with red color.