This picture appears to have been kept in a wallet. The constant motion wears away some of the surface and grinds dirt into the smudged area. Some of the dirt could be physically removed from the original photograph, and the partially cleaned picture was then digitized. The children were selected and extracted from the digitized image, and all remaining dirt was cloned away by restoring facial and other detail. Colors were adjusted as required to match the original. Lastly a new background was created.