So you want to make a kids book characture

I was asked one time how do you get a black and white drawing and make it a color illustration without redrawing the whole thing. Well this is how you do it.
1: Scan the sketch and bring into photoshop make the white transparent then make a sublayer.
2: then on as many sublayer's as you want put the colors where you want them.

3: At this point you can add new layers to give the image some depth.

4: Then let the creative juices flow and have fun.
5: depending on the overall look of the book backgrounds can be added later.