picture graph
Is called a glyph.
A caption.
Its called a picture within a picture The term is inset. A picture that has a smaller copy of itself within the picture, with the copy having an even smaller copy, that continues to (theoretically) infinity, is called a Droste Effect or recursive picture.
It is called an Avi (avatar) or DP (display picture.)
A thumbnail picture
That's an "inset".
This picture is called "pictogram".
The picture is called "tennisball."
(picture)-framer
A picture of chromosomes is called a "karyotype."
The tiny picture on a computer screen:http://forusa.40host.com/about-au5a/index.html