By Todd Lockwood [Illustrateurs]
By Mathieu Reynès.
Sheena and Snowbird
By Katie Cook. [Tons of other Marvel heroes in that link]
Artist Unknown [Illustrateurs]
By Petr Stuchlý. [Love in the Time of Chasmosaurs]
Knighthood, a ghost-cowboy, a warrior-goddesses, and the greatest team-up of all time after the break
By Edmund Blair Leighton. [Golden Age Comic Book Stories]
The Ghost Rider
By Frank Frazetta. [Golden Age Comic Book Stories]
By NC Wyeth. [Golden Age Comic Book Stories]
Yo, DC! You totally have to get Ryan Kelly to draw Supergirl!
League of Extraordinary Gentlemen '88
By "Rusty Shackles" (an obvious alias for Rusty Shackleford). [Comics Alliance. Sometimes, I love April Fools Day]