I selected the boat, copied it and enlarged it and mirrored the image and then put it on a separate layer, covering a lot of the original boat. It then took me three separate attempts to clone in the missing water and cover the parts of the original boat that were still visible. Check the back of the boat with the red canopy - it is actually the original top of the tug, and the reflection underneath is cloned from the reflection of the boat on the far right. Making an object larger to hide the original (mirrored or not) is usually straightforward, but the cloud reflections and highlights on the water made this really challenging.
