Age interpolation

A slightly chubby, slightly wide-shouldered mouse in his late adolescence stands on his hind legs. He shows little signs of anthropomorphism and his lanky tail lies on the ground.

Frank, as I usually draw him, is the equivalent to 20 years old in human terms. I recently started drawing [what he'd look like as a kid]. This would be fine, except that the story I want to tell starts when he is the equivalent of 18 in human terms.

So what I did was I overlaid both drawings, one on top of the other, and tried to draw a line at the midpoint between the two.

The whole process took about two hours. You can watch it in just 7 minutes [here].

This drawing is not meant to look professional; I created it just for my reference when I go to do the story later on.