>>2211644>>2211877GIMP isn't my area of expertise by any means.
But I think you'd best practice with the gradient fill tool.
This image should be self-explanatory.
For a local splotch of color, like the linear highlights on the legs of
>>2211772you'd draw a white line and then Gaussian blur it into the skin-tone.
Doubtless there are "tricks" I don't know.
