Rating pictures

All pictures in the Escher page have a rating assigned to them. The rating is a number that describes the quality of the picture. Low numbers mean the picture is of better quality than high numbers.

Starting with the base of 1, points are added for each of the following:

When pictures are displayed in responce to a database query, the worst-rated pictures are sorted to the bottom of the list of matches. In this way, the user sees the best quality pictures first.