Draw or describe an image to replace the '?'.
WARNING: Contains added color and flavor.
An image of a rainbow
The shown images seem to fit the story of Noah. At sea in a ship (image 2) for 40 days and nights (images 1 and 3). Noah sent out birds to see if there was land again (image 4) and one returned with a branch (image 5). The story ends with landfall and the rainbow.
Image of an anchor.
The sight of birds at sea is an indication that land is nearby, in the image after, clearly land is shown. So next step should be to port the ship and drop the "anchor".