To be honest with you, Bernard and Bianca aren't my favorite designs for Disney mice, but when Ollie Johnston draws them...how can you not love these characters?!
Just like his mentor Fred Moore, Ollie's work has always such appeal. These are big drawings on 16 field paper. They had to be part of a pose test, because there is no way drawing #7 can follow #6 without any inbetweens.
So much emotion in these sketches! His words of wisdom to us young animators was:
"Don't put drawings on paper, put feelings on paper!"
In retrospect, that was the best animation advice I had ever gotten.