Dave Rapoza is an artist I look up to a lot which is funny because we're basically the same age but anyways, his art for one is absolutely stunning. You can find his website here (http://daverapoza.blogspot.com/).
One thing awesome that he does is really go into his process and freely answers questions and share his knowledge. His livestreams are an incredible source of artistic knowledge ranging from freelancing questions, to his process to interviewing various pros in the industry. I highly recommend looking into this resource if you haven't already haven't heard of him.
Click on either one of the images to be taken to his livestream: