Expandable character images on casting calls

The images used for character roles are quite small. At most you can reasonably fit a character's head, but for some kinds of characters (non-human, for instance) that's not adequate. Additionally, some people aren't fantastic at figuring out how to upload images properly so you sometimes get weird crops. You should be able to click (or tap) on the character image in order to see the full thing.
Additionally, it might be handy if you could upload, say, up to three images for a character. I've seen people use a neutral image for the character pic and then link images with more characterful expressions.