Ray Toh is a freelance illustrator and concept artist from Singapore. I managed to meet him at STGCC 2010 and he gave me a copy of his art book. It's a 40-page paperback.
Ray started out as a background artist but now creates and paints characters as well. Inside features some of his personal creation as well as some fan art. The art is pretty cool.
You can check out more work on his blog and get his contact should want to buy this book.