When pressed for time, one of my favorite things is animation master Seamus Culhane's "One Minute Sketch" drill, which tunes you up in a hurry when done consistently! And once in a while, some decent gestural scribbles survive the process.
These are roughs from a proposal for my producer at Warner Bros animation. I'd still love to see a "Supergirl" animated show, with the light tone of "Bewitched" or "That Girl".