How you can setup blender texture nodes to have paint layers with opacity like photoshop or gimp.
Colour, Damn Right.
What is your workflow to combine all paint layers to a single image texture file?
Just Bake what you need. Since there is no reflection or bump, all you do is bake diffuse color.
I was not sure about Diffuse baking, it bakes shadows into texture map. (It’s default here).
But after fiddling with params, Render // Influence // Only check “Color” does the job.