The Green Turtle by Jim Steranko

Yeah, Steranko has rendered a lotta great golden age heroes, but nothing compares to this guy.  His cape alone is worth the price of admission.  "Ten dollars gets you the whole seat, but you'll only need the edge!"  Ah, Monster Truck rallies

 

The Invisible Girl by Jack Kirby

If I'm grok'n correctly, this is weirdly wunnerful.  First is the 2nd printing of the Marvelmania Fantastic Four poster, with Sue Storm actually turn'n on (or off) her invisibilty.  It also looks a lot like the time Jack colored it himself (second image) with Reed's boogered arm, but beautifully understated colors.  Third is the first print'n, and it's always bugged me, with Reed's one sunburned cheek