Also, if you haven't seen it yet, be sure to read Michael Dean's excellent obituary of the man here. You started off, the early Sick, Sick, Sick stuff at least, very angular, no fluidity, and sans the spontaneous line you developed later. Those drawings you found in that pile, some of them date back to those years, and almost all of them are more interesting than you’ll find in Sick, Sick, Sick, because as soon as I got to reproduction, I would stiffen up. I could handle a pencil well, but you couldn’t reproduce in pencil. We also have Feiffer's introduction and afterword from his -- dare I say essential -- book, The Great Comic Book Heroes:In drawing style, both in figure and costume, Superman was a simplified parody of Flash Gordon.