<span>Replace each smiley on the image by a letter and then use a cryptogram solver like http://www.quipqiup.com<span>It gave the following text</span><span>THE SUN CAME UPON THE SPANISH SEA</span><span>OUR HOME LAND FAR BEHIND US</span><span>BEING JUNTED BY THE KINGS NAVY</span><span>ITS SURE HED NEVER FIND US</span><span>PULL AWAY ME LADS O THE CARDIFF ROSE</span><span>AND HOIST THE JOLLY ROGER</span><span>The flag was jolly_roger</span></span>