I am working on a caricature of Alice Cooper and I'm using Photoshop. It isn't finished, so I cropped it for the tutorial. I start with my sketch, and make a full value drawing. Often I will start with a pencil sketch and scan it to my computer. But this time I went straight to the computer and sketched it there. Here's my original value sketch.
After I finish my value sketch, I copy the layer, put on the bottom layer and lock it. I keep it as a spare just in case I need it. Then on a new layer above the top sketch, I fill the canvas with one color. Then I drop the opacity to 30-40 %. I use this color to give an overall hue to the picture. I wanted to give him a cadaverish feel. So I chose a gaudy lime green, which is also the color of Alice Cooper's album, Billion Dollar Babies.
Using a soft brush, I block in my colors. I keep opacity down so I can see the underpainting. One disadvantage to that, I can't pick colors from within the layer. So I have a color palette on another layer. As I lay dow the colors, they mix with the green background, like this. . .
After I have all colors in, I flatten the color layer and the top value sketch. Then I add a new layer at full opacity, and with hard and soft brushes, I start adding the details, and highlights.
I'm definitely not finished with this. The face is basically done, but I still have his clothing, and other details to finish. I am not a teacher, and I have probably left steps out. Some things are automatic to me, and I don't think about it. So if you have any questions, feel free and ask me. I'll be glad to answer them.
Thanks for looking,