We were told to draw 3 facial expressions, and later add in-betweens to them, to make a constant transition between them, as pose-to-pose animation. Once that was done, we had to draw something in to justify the character’s expressions using straight ahead animation.
I think I did quite well in the pose-to-pose: the character was detailed enough to be distinguished, while still being simple enough that drawing him every frame wasn’t too much of a hassle.
However, I didn’t quite know what something could happen in a background to make him emote in such a way, so I simply drew something on the same plane: it’s small and choppy, which doesn’t mesh well with the pose-to-pose. I’ll have to remember this next time I do something like this.