Candid
Monochrome.
are you going to show me a picture of coal
Something in a glass case - is usually called an exhibit.
The force that holds a picture on a wall is the force of friction between the picture hook/nail and the wall, as well as gravity acting on the picture downward. These forces combine to keep the picture in place.
To move a picture freely around a document in programs like Microsoft Word, you would need to change the text wrapping or layout setting of the picture from "In Line with Text" to "Behind Text" or "In Front of Text". This allows the picture to be placed anywhere on the page and not constrained by the text.
picture graph
Is called a glyph.
A caption.
It is called an Avi (avatar) or DP (display picture.)
The area in the background of a picture is called the background or backdrop.
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.
A thumbnail picture
That's an "inset".
The picture is called "tennisball."
This picture is called "pictogram".
(picture)-framer
A picture of chromosomes is called a "karyotype."