Remember the can-do spirit of lunar exploration? Back when it seemed the heliopause was the limit? Back then, artists like Norman Rockwell and Robert T. McCall painted bright, optimistic moonscapes and astronauts. Here's a gallery.
Most art is from NASA. National Geographic images from MySpaceMuseum. Robert T. McCall art from artist's site. Thanks to commenter Andrew Liptak for suggesting the moon paintings by astronaut/artist Alan Bean.