>>11348821
Here's the gallery:
catbox.moe/c/h3yc3o
I'll make a rentry post to explain what the edit was (and why in some cases) as well as link to the original
I won't bother with some of the edits like this which are just meant to explain things

>>11348931
>i don't know what that means
It means what it means. Using the multiply layer blend option (Gimp has it, but I'll still recommend IbisPaint on the phone as the superior of the two, unless you have a drawing tablet)
Use an air brush, keep opacity 10%, and keep it fairly large (I went up to 20% and shrank the brush which was a mistake). You could try adding texture with a textured air brush or a low opacity brush, but this was just the standard one which seemed good enough