1 - on royal caribbean mariner of the seas. we were in blue water and a day away from docking at nassau. took photo on december 4, 2018 at 5:18pm (according to my phone's documentation), from ship's balcony. the two white images (one appears structural and the other appears to be light shining on water but not as a beam) were not in the photo when i took the photo. i noticed the images days later at home when reviewing my cruise photos. 2 - noticed object when i looked at my photos after my vacation. we were out on the ocean with nothing seen while taking photo other than the beautiful sunset and clouds. 3 - a buoy, then definitely not a buoy. appeared to be above water. 4 - since i didn't see it while taking the photo, i cannot state its actions or motions. 5 - after seeing the photo, it looks very unusual to me. i felt intrigued. asked others what they thought it could be. some thought it was in the water but i think it is hovering with light shining down onto the water. 6 - never saw sight. noticed after i was home from my vacation viewing my cruise photos.