A.C. Farley's cover to TMNT Collected Book Vol. 4, published by Mirage. This one containing "Return to New York" (obviously).
Farley's covers for the old Mirage trades make them worth the (unfortunately) high asking prices they tend to go for. Some of his all-time best work.
His best cover is probably the one he did for Veitch's "The River" trilogy. I'd post it, but I can't find a scan in decent enough quality, and alas, that particular volume is the hardest to find.