Marko Manev's superhero noir series takes your favorite superheros and puts them into a scene straight from a film noir movie. I love the look of the heroes against dark silhouettes instead of their normally bright and colorful costumes. It definitely gives them a beautiful edgy feel.
Deviant Art user LadyAdler combined her obsessions of Alphonse Mucha, 50's style pin ups and Disney princesses to create this beautiful set of Art Nouveau illustrations. I love the flourishes and background elements in her work. They add a lot of depth and meaning to each piece.
If you like these, don't forget to check out the rest of her portfolio. It is chock full of more great stuff including original works.