I am re-reading Taking Risks with Watercolours by Shirley Trevena. I have taken up watercolours up again recently, and I find I am struggling with hard edges and flat colours. Shirley Trevena to the rescue! She mentions at the start of the book that she would use photographs she finds in newspapers or magazines as an inspiration for a painting.
And I just happened to come across a photo from an old newspaper, that I had cut out as I found the child's expression striking. This is just a little sketch, done with Inktense pencils, but I might develop it into something more elaborate.