Content-free pictorial realism

What is it for a picture to be more realistic, or more depictive, than another? Without committing to any thesis as to what depiction consists in, I show that degrees of depictiveness are grounded in a certain relation between two basic kinds of differences between pictures: configurational differences and content differences. A picture is thus more depictive just in case it is seen as having fewer nondepictive features, whereas a nondepictive feature is individuated through the susceptibility of the picture's configuration to change without entailing any change in the picture's content.