Yay, free giveaways from the Dimwit and his sponsor, Breygent Marketing! Thanks Sam! I love comic art and these cards are great, exhibiting bold colors and excellent artwork. The "Warlord of Mars" is, in fact, John Carter (created by Edgar Rice Burroughs) - main character of Disney's eponymously-named, massive box office bomb.
Red Sonja! Badass, voluptuously-proportioned redhead barbarian. While I do enjoy the Dark Horse Conan graphic novels, I unfortunately have not read any Red Sonja comics yet.
I am the least familiar with Vampirella out of these three characters. One can construe that she is likely a vampire, though. I am of two minds about her outfit. Either that it does not seem very practical (no pockets), or perhaps it is just functional enough (to cover various bits and such).
Thanks again to Sam at The Daily Dimwit, and consequently, Breygent Marketing!