First up is a quick sketch of my electric kettle.
Next is the hybrid orbital structure of methane, CH4. (Yes, this does count as a doodle.)
A doodle of a skeptical lion.
And, finally, a drawing of Lyra Silvertongue, the main character of the His Dark Materials trilogy. (Shown without her daemon, Pantalaimon.) I'm actually pretty proud of this one because it really captures how I see her in my head. (Also... NOT a first attempt. Been trying to do this one for a few weeks now.)