Hello,
i wanted to ask how would u try to blend if the lighting is supposed to look a bit "Renaissance-ish" or like Rembrandts Pictures.
Do u have some tips and tricks, or pics where u can Show me ?

I suspect you may be asking in the wrong forum. The Visual Design Group forum is primarily for discussing the visual design of KDE software.

If you are interested in tips and tricks for using the Krita painting application, you might check out the Krita forums.
If you are looking for assistance with doing some of that in Gimp then please post this in Gimp's forums.

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