James Gurney, creator of Dinotopia, shares wit, info, and news on a daily basis via his blog Gurney Journey. Frankly, it is considered to be one of the best blogs out there for realist artists. I stop in daily and always leave holding at least a nugget - but at times a bucketload - of insight.
Here is a tiny sampler:
Is Moonlight Blue?
Light and Form, Part 1
Yesterday the "White Test" was honored with a post. Thanks James.