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Animals are a lot of fun to draw because they can often have dynamic poses. Plus I find that animal anatomy is really interesting and helps to inform the motion, mass, and weight of human anatomy.
It's really amazing what computers can help accomplish nowadays. I use Photoshop and a pressure-sensitive Wacom Tablet to put these together. It's a pretty fast way of getting an image together (if a little frustrating on pen control compared to drawing in real life).