Yes, I made that one, thankyou. You could do something similar in Blender although both Terragen and Blender have their own learning curves for beginners... Blender is free, not sure if it does clouds.
There is a free version of Terragen that is limited in the size/quality of the rendered image and number of objects it will handle (not a problem if there's only one), and that Flickr scene (minus the distant island) is really very simple. Import object, add water, add 3 default cloud layers and render. If you were to try it, I'd suggest their forum if you need more help with that.
You could export an orthophoto looking across at an island from Photoscan but it wouldn't have any sky or water. You could try and fake that in Photoshop/Gimp but it's not that easy either.