>>11361288
>i enjoy retracted foreskins on men, but not on women
Weird, but okay
>oh, maybe making the smegma darker would in fact be what i felt was missing from that edit
Darker, or maybe a different hue or saturation. This gets into what's known as colour theory, in particular the concept of colour matching and colour context. Different colours of smegma will match different colour skin tones better, and the skin tone itself will change the perception of a colour (this mostly comes up when there's coloured light sources)
I use the same base colours for the edits I do, but I'll often add a hue/saturation/lightness filter on top to mess with the colours a bit to match the skin tone. Here's an example sampling from Zyldark's colours. I started with thr same base colour and used a filter to change it to match the skin tone a little better.
(I don't know if you can do this with Gimp, I think i heard something about them adding these sorts if filters not too long ago)