The ship in question is thought to be that of a grain ship. This ship was the equivalent to today’s bulk carrier in that its primary purpose was to carry grain and other bulk goods. However, it also was known to be a passenger and troopship as well. The ship in the Crabtree collection is a smaller version of what Paul's ship may have been (about 70 tons). I also have read that his ship depicts that of a Roman military supply ship designed to carry troops and supplies.
These ships are thought to be the largest of this time of about 200 tons and maybe averaged about 100' long. They are thought not to be crewed no more than a few men based on how these ships were rigged. They were powered by a large mainsail and two steerage tillers. The mainsail had brails and braces rigged to the stern so that the helmsman could have both steerage and sail control. Some ships are thought to maybe have had a foresail on a jury mast (hence as described in Paul's text) and a topsail and spritsails for better maneuverability in shallow water. No ores were used in powering the ship; however, again, it seems logical that they may have used sweeps for maneuvering such a large, bulky ship in tight anchorages.
Far as the painting and figureheads. This can be anyone’s guess. Many say the ships were never painted, some evidence shows that were plated in lead sheets below the gunwale to protect against worms. Since these ships were used in so many different ports of different cultural influences, it would be better to understand the local traditions and customs of decor of architecture of where the ship was used, and then depict the ship with that decor.
I have been on a Lutheran research committee for several years that is writing a series of books about the Apostles. My part has been doing the maritime research in order to construct a grain ship for the book.
One book that I had just acquired and would like to suggest is Shelly Wachmann’s “Seagoing Ships & Seamanship in the Bronze Age Levant.” This book, unlike most that deal primary with the military ships, goes into detail of all the different cultures that influenced the design of the ships, as well as daily life and seafaring customs on these ancient merchant ships.
Scott