The cover to AVENGERS #47 by Don Heck and Frank Giacoia
The cover to AVENGERS #62 by John Buscema and George Klein.
Looks like that Black Knight head was statted and repositioned.
Opening splash page to AVENGERS #25 by Don Heck and Dick Ayers.
A note at the top asks for:
MORE BLACK IN SCARLET WITCH’S HAIR
The cover to AVENGERS ANNUAL #7, both with and without the vellum overlay for the background, by Jim Starlin.
A page from AVENGERS #97 by John Buscema and Tom Palmer. Also pictured are the sketches on the back of the board that John did to warm up.