Have the same problem as you have a lousy drawing
.
Although I know how to make a nude patch with TexMod created for GW, but it fails because of my drawing.
But maybe I can give example then A few tips is
When you edit the textures in the alpha channel add / remove gloss / ( by Schwartz to share weiu einfarbt The brighter the stronger the gloss)
If TexMod share in logging mode displays greenish-
transparent they can be most make clear by the shades in the texture alpha channel black.