Love this series of digital art portraits by RISE Design Studio. The dark undertones mixed with carefully highlighted areas really makes these images stand out. If you like these, you should also check out RISE's wonderful windows series.
These are some dark but still amazingly beautiful illustrations by Yana Moskaluk. They are based off of different Russian fairy tales. I love the exact very precise use of lines in the drawings, the selective coloring, and the use of patterns in these illustrations. There are some more lovely illustrations in Yana's portfolio.
I am a huge fan of Michael Ostermann's digital art illustrations. Each one sucks you into a surreal alternate world. Here is how he describes his process:
"Every project is different; in both needs and approach, he usually likes to start with a good photograph, a good idea that sets the mood of the overall image. He then applies his self-made resources and uses several photo-manipulation techniques, seeing where it leads."