These images were photographed from the top of the Eiffel Tower in Las Vegas. It would have been nice to have had the use of a tripod, and unobstructed views, but sometimes you have to do what you can.
The size of the Image (pixels) determine the level of sharpness and clarity for print applications. For more discussion on this, refer to: What Is High Resolution?. In general, 300 pixels/inch (or dpi) produce a high quality print. For larger wall murals where the distance of the viewer is greater, much lower dpi numbers will produce a good result.