Are you interested in using any of Daniel's art for your commercial endeavors? You're in luck. Almost all of Daniel's art can be licensed for commercial use.
Examples include
His work even appears on information boards at a zoo in Houston!
So if you want to use Daniel's art in you project (or you just want a high resolution version of one of his works) Check out the Pixels.com Licensing Service that handles all your licensing needs for Daniel's art.