People have asked me to explain a bit more about how I knock out my pink paper backgrounds from around my pastel drawings, like the one above (see Working on the Scans), without losing the detail. Which means this is going to be full of computer stuff, so if that's not your thing, just close your eyes and it won't last long...
So that nothing is final, I don't actually delete the background at this stage, but create a layer mask of it, which can then be adjusted.
I create a new layer in an arbitary, midtone colour beneath my work, to test how things are looking as, in the final book, the vignette won't generally be seen on white, but on a colour.
Once the cut-out is satisfactory, I use the clone stamp to brush over places around the pastel-textured edge where there is unwanted pencil line showing, from my original guide-line, or any other colour anomolies.
I save the image with the mask layer still in place, so that the colour of shadows (or smoke, like in these examples) can still be easily adjusted, depending on the colour background that is finally chosen to sit beneath the illustration.
By the way, the illustrations here are more characters from the batch of scans I am working on as we speak, for the story Dragon's Dinner by Susannah Corbett, due out next year.