Alva, Again
I'm finding that there's not much more relaxing than a kitty drawing. I'm finding that cat paws in particular are fun. Perhaps it's just that Alva is such a walking flood-ball, and his paws are about the only place that there are actual lines to draw accurately. Almost everything else is a slightly larger or smaller blob of fur - that can be really difficult to get just right. It's much more subtle and difficult to compare accurately. Perhaps that's part of the relaxation though. Just get the eyes, ears and paws right, and the rest can be pretty unspecific and still look vaguely cat-like.
-ZR