Out of respect for Namor here are some scans:
http://i6.photobucket.com/albums/y226/jjschm20/evenhulk.jpg
And one the best fights eva, watch how he matchs immortal Hercules:
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-13.jpg
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-14.jpg
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-15.jpg
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-16.jpg
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-17.jpg
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-18.jpg
http://i6.photobucket.com/albums/y226/jjschm20/Hercules/AvengersV1262-19.jpg
Japanese people were portrayed in popular American media at the time as tiny little mongrels. It is a racist statement, but it's a microcosm of U.S. sentiment at the time.
Namor appears larger than life on all of the covers to show how badass he is. It has nothing to do with his powers, it's just hyping up the action.