This is a pen and ink of the cover for Avengers Classic #5 by Art Adams. Which was itself a reprint of the original Avengers Vol 1 #5 which featured the original Avengers lineup going up against Molto, Supreme Warrior of the Lava Men. Not perhaps one of their stronger outings.
It's probably unfair to directly compare the two given the difference in publishing practices and art styles in the intervening forty years, but I know which I prefer.
The Avengers — The Invasion Of The Lava Men by Eoghann Irving, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.