Most months, I enjoy taking part in the Character Design Challenge on Facebook: They provide a theme and artists do their best to create a character design to match. It's great practice and I've produced a number of terrific pieces through my participation. Here are some of them.
Gandalf the Grey.
Hansel & Gretel's witch, using her gingerbread for other inventions.
Ganesha commuting. (Ganesha was said to have ridden on a mouse.)
Jet Black, from Cowboy Bebop.
Skateboarding Cholita.
A Kasha, a type of Japanese bake-neko, or "monster cat." The Kasha were known to invade funerals, leaping down from the rooftops to steal corpses which they would eat.
Delivery Orc
Marvel's Squirrel Girl