I thought this would be a good topic to see in this forum, especially since I read D_G's mini-lesson on shading in the tools thread.
Post any lessons, tutorials, hints or tips you have regarding art "how-to"s. This includes drawing, painting, using Photoshop, etc. Anything you know how to do, please feel free to share. Also please feel free to share any links to tutorials/how-tos that you may have and feel that are useful.