.
Original Concept
This is the original cover that Marie Severin did for TTA 101. You'll notice Hulk is jumping because he's going over the wall into Asgard. Stan Lee thought the wall broke up the flow of the cover so he had Jack Kirby redo the bottom of the piece.

See Below

Published Version
Here you see Jack's version of the Asgardians. The bottom half is original art by Jack Kirby on an overlay. The top is a stat of the all Marie Severin original art cover pictured above.