JOURNEY INTO MYSTERY #94, 1963. Dick Ayers inks, with a nicely arrogant looking Loki.
LAST OF THE VIKING HEROES #1, 1987. Mike Thibodeaux inks this, one of the bits of art that Jack Kirby did for Thibodeaux's 1980s comic. I kind of find Thibodeaux's inks a bit too slick, but it's a nice cover.