Hark, a Vagraint is a wonderful webcomic by Kate Beaton. She covers a range of subjects from history to literature and, as seen above, occasionally draws a dandy strip satirizing our favorite super heroes. I have been reading her strips for a couple of years and they are an absolute treat. They range from silly comics about the "Sexy Tudors" to the tragic but amusing life of a chimney sweep. Her comics are usually done in black and white, a style I prefer, but occasionally she does colored comics like the one above. Check out her website and if your really dig here, consider picking up one of her wonderful books.
P.S. She is so cool she even got an homage on Adventure Time dedicated to her Shetland Pony character in the episode "The Eyes".