Yeah, this makes me want to go there. I'm sure you've heard pleanty about the landscape orientation, and it seems that a portrait orientation wouldn't have the same impact. It'd make a great poster though!
The clouds are absolutely breathtaking and the mountains in the background are nice. This is a lovely picture and it's done well, but I don't actually see this as a magazine cover. Why? Because I don't know how it could be edited to fit the dimensions of the cover. If you crop out the viewer's right, you cut out the clouds and if you crop left, you have the clouds, but cut out the boat and people in the water. I would actually see this picture on the inside of the magazine featuring this place in an article. 8 Good luck in the challenge.