If a post (which is one of the top posts) contains more than one picture, then the "Top Posts & Pages" widget selects one of these pictures to display. Randomly, I guess.
Is it possible to force the widget to select a specific picture?
(something like "From post A please show a thumbnail of the 3rd picture, from post B take the 1st one, ...")
The blog I need help with is nummervier.wordpress.com.