I usually like to work on one painting at a time, from sketch to finish. My mind focuses on the image better that way, because even as I work on the sketch I start getting ideas for the color schemes and for little bits and pieces I want to incorporate when I get to the painting part.
Unfortunately, when working for a client, I don't always have that luxury. Sometimes I'll work on sketches for multiple clients at once, since the response time of ADs can vary, and the sooner I get approval for a finalized sketch, the sooner I can start painting it, in my own time.
Since this project is on a deadline, I don't want to waste days sitting on a sketch and waiting for the art director to get back to me about the pieces one at a time, so I have to work on several sketches in parallel. This art director was out of town for a few days, and I managed to make my way through 6 finalized sketches (all ready to go on the illustration board and set for painting).
I'm thinking that since I've gotten this far, I might as well finish sketching all 12 of them, and then I can settle into the painting part next week. The sketching is the hard part of a piece. It is the phase that I find most draining, because I have to actively brainstorm, think about composition, placement, and anatomy. Once an image is laid out, the painting almost happens by itself, even though it takes longer. It's meditative in a way.
Taurus

Virgo

Leo

Cancer

Gemini (was worried my male/female twins here wouldn't pass the AD approval, but yay it did!)

Aries
