Hy Eisman sits at his professional drawing board, much the way he has for seven decades. He is reminiscing about penciling a comic-book image from a page that yielded him $10 back in the ’60s. He says his rendering, though, would soon inspire the pop artist Roy Lichtenstein, who became rich and famous by appropriating such comics without credit — and with a projector — for his large, highly prized canvases.