Which indirectly goes back to my initial question: besides nostolgia, what is it about his published art people like? Yes, he could manage large groups of heroes, but it also seems to be part of what any professional artist should do.
I hadn't realized it before I had seen the JLA splash above, but he seems to have been good at the lost art of drawing small, tight buns. That's a valuable skill, and rarely seen in this age of large buns. Why he has Wonder Woman standing like that strikes me as unnatural.
His line work was simple, but not particularly interesting in my opinion. The characters in some of his pieces have unnatural anatomy laid out.
So, what else justifies some of those prices I have seen besides nostalgia?