How to enhance a background - by Thomas Romain (one of the few foreigners working in the anime industry in Japan)
PROCESS by ~JakeWyatt on deviantART
BGs+Perspective2 by *nargyle on deviantART
I see this guy's paintings featured every so often on different sites and always click through to see who it is, only to realize it's that same person (Jon Foster).
Illustration by Jean Giraud, "Moebius" for "The final Incal" | Flickr - Photo Sharing!
Asaf Hanuka: The Realist - Imgur