Adding shadow to author image

I recently purchased the Pro version and it’s working great. Excellent, well-coded, and lightweight author bio plugin.

I did notice on the plugin screenshots a nice depth on the author image in every round and square example. It’s sort of like a subtle drop shadow. On the square author images, it even shows nice rounded edges.

I can’t find an option anywhere in the settings for this and, again, I have Pro so I should have access to all settings.

I see the “long flat shadow” option, but that only adds a shadow within the social icon boxes.

Thanks for your help.