When you're living on a ship, you need to be able to build or repair anything you might need. So it was pretty important to have a carpenter and a blacksmith on board. This is, perhaps, the smallest, most economical smithy in the world: nothing but that tiny little anvil and a vice. The big thing behind him is the back of the tryworks, which, I suppose, must have doubled as his forge. Here, he's acting as a cooper. Barrels, of course, would have been a major feature of life aboard a whaler. Everything you'd eat or drink would be stored in them, and, of course, you'd be trying to fill them with whale oil as soon as possible.
And this is just a length of ship's chain, used to tether the anchor. These links are each a little smaller than your head. A length of chain may not be a terribly exciting subject for a drawing, but, I dunno... I've always liked the looks of these chains, and I was interested trying to get the texture of the metal right.