Posterlounge
While looking at Nanoo's work, I came across the the Posterlounge shop in Germany, where you can select from over 950 illustrations from artists based all over the world, selecting between an art print or a print on canvas. Categorized by styles and topics, finding exactly what you want is a breeze. I love their customer photos section - customers submit photos of their Posterlounge finds installed in their space, it's really fun (tres helpful, too!) to see how these images look in rooms.
Enjoy!
(images from posterlounge)