This certainly seems like a way to increase the likelihood that I associate a response with a flashcard in Anki, but will this actually help recall? 

For example, one of my Anki cards might ask how to recursively copy all files with a certain extension out of a directory tree; by adding an image I might strengthen the association between the front and back of the Anki card, but not increase the probability that I actually remember the correct invocation to move files when I really need to. 

This is a failure mode I've noticed before with spaced repetition, where I'll quickly have a response to one of my Anki cards because I only have one question in a given format, even though answering the true question would be harder. 

Is there a different style of flashcard where this wouldn't be a downside? The downside above applies if you associate Question + Image -> Answer, but maybe a custom card type that breaks down each pair into a triple would work? Question -> Image, Image -> Answer, and finally Question -> Answer. I'll give this some thought.