Greek character forms cuter image (7)
I believe the answer is:
Here is my best explanation:
'image' is the definition.
('picture' can be a synonym of 'image')
'greek character forms cuter' is the wordplay.
'greek character' becomes 'pi' (letter from the Greek alphabet).
'forms' indicates an anagram.
'cuter' anagrammed gives 'cture'.
(Other definitions for picture that I've seen before include "Depiction", "Drawing", "Painting, drawing or film", "Visual representation", "Imagine; film", "Portrait; film", "One can paint a thousand words, it's said", "Representation", "Hanging wall adornment" and "A visual representation".)