I found the most wonderful site this morning. It's called I am a Child and it it FULL of paintings featuring children. Most of what I have seen is from the 1800's, and so should be public domain. This one is Girl with a Bow in her Hair, by Gaston St. Pierre.
The ribbons are from Scrapbook Flair and the background was made with a bokeh piece from Shadowhouse and some PS brushes.