From the pictures of leopards you linked to, the main difference seems to be that leopards have little to no visible whites in their eyes. Maybe that's supposed to be what stands out about Micah's? I'd think that would be noticeable, though maybe not something that would stick out at a glance.
I've wondered about this. I mean, a lot of it also seems to be eye shape between leopard and human so I am wondering if maybe some white would still show in human form. I could see there being less white, but would all of it be hidden?