Here we are. A drawing of someone named Charlie. I have no idea who Charlie is.
I painted Charlie's jacket with a brown sort of color on Multiply then turned the opacity down about 50%
I filled the piece with a layer of a reddish Soft Light again, at about 50%
Charlie's skin tone goes in. Multiply on 70 %. I did more opacity changing with this one, more because I wanted to give the pencil a change to work.
I gave the skin a little life with Soft Light.
I cleaned up the pencil work just a touch with a layer of Screen.
I was liking the way it looked so I pushed the pencil on the face back just a touch with a layer of Lighten around 50 %
I strengthened the hair and eyes a little with a layer of Multiply.
The pencil on the face felt a little too strong still, so I pushed it back with skin tone on a layer of Normal, low opacity.
A little blue rim light with Screen.
And for the kill. A final layer of Soft Light at %100 to warm it all up.
I did this drawing a while ago at work during a down time. I painted it a couple days later just for fun. No big reason. If you are interested in the reference I used for old Charlie here, you check see it here.