Many users right-click on images as a way to download them (clicking the "save as.." option in the contextual menu). This is bad because users may get the scaled-down version which is used for display purposes and they are not given guidance on how to attribute.
The download panel should be automatically opened when the user opens a contextual menu on an image, so that we can help users to discover an easy way to get the original file (or other sizes) as well as remind about the need for attribution.