I've always considered myself an okay character designer - I thought I was really happy with Fire Tiger and Acid Panther's designs. They both looked perfectly cat like, Acid was slinky, Fire was bulky, and most importantly, the designs were appealing.
I'm finding, though, as I animate with no lines, that the designs just aren't up to scratch. I had never factored in readability in such an implicit style, and it's coming back to haunt me.
Not much I can do about it at this stage, but I'm glad to learn of my mistake so I can do better on the next film.