So if you are learning Blender why not try its texture painting tools? They aren’t as good as substance or photoshop, but for the scene like this I think they’re perfect.
I've been working in the texture of the No Face character, in substance painter and photoshop, I used the low poly as high poly to make the bake maps, this way I could did gradients, shadows and highlights and color variations with generators and filters, (working in 128 size) after that I used photoshop to make more…