I adore this self-portrait of Jack Kirby (with inks by Joe Sinnott), which I recently saw online. I couldn't stop myself from coloring it! (I didn't try very hard to stop.)
Here's the original--
There's so many things to love about it-- A smiling Jack Kirby, a laughing Ben Grimm (aka The Thing), plus Dr. Doom and the Red Skull being wacky villains. So great!