My first Serpentor custom was Serpentor from his first battle against GI Joe, in the Battle of Springfield (as seen in the original Marvel run...) This version is Serpentor in his fighting armor as Cobra Emperor!
I basically gave him a new head (though the same as my previous Serpy custom, for continuity) and re-painted the helmet to match his gold and orange armor. I then added a red cape permanently, under the snakes near his shoulders.
Thanks!