Okay, so I just reopened an old image of the Swan hatch painting and found some interesting things there.
First off, the top right corner features two men, one colored white and one colored black. Is this Jacob and MIB?
Next, a boat. This could be the Black Freighter, but the ship looks like an older ship, such as one built by an ancient civilization. Was it meant to depict Egyptian travelers?
Lastly, there are fish all around. I know that there is obviously fish around the island, but I was put in mind of the fish Jacob roasted at the beginning of the season 5 finale.