Do a search on eBay under ---"Man O'War" painting portrait---or some such. Plenty come up usually, but it's not overwhelming. W/in a few weeks you may see versions of what you're interested in. If not originals, prints and even lithos may give you an idea. And go by selling price, not initial bid.
Include all poorly spelled versions of "Man O'War"; I do for my searches. It's doubly important because he has more than 1 word to his name and that wonderfully annoying "o" and apostrophe. People butcher his name on eBay so you need a big "OR" boolean operation.
