I found some great tutorials on DeviantArt. They are from the artist “meago”.
For a long time I was searching for a possibility to colorate scanned sketches and doodles. I tried different masking techniques and so on … but never got the easy idea to take the layer with the doodle as “multiply”. So this is the first doodle I was coloring this way.
If you want to take a look yourself on the tutorials you can found them here: tutorials
And if you want to take a look at the whole picture, visit my DeviantArt Account
I now scanned a dozen sketches which are waiting to get colored 😉