Color and Light: A Guide for the Realist Painter (Volume 2) (James Gurney Art)

Shadows/Shading: How to Shade a Drawing - YouTube Perspective: Introduction To Perspective (youtube.com) The two above videos are from Proko and David Finch, their lessons are some of the most reliable and accurate free lessons I've found on Youtube. Framed Perspective Vol. 1: Technical Perspective and Visual Storytelling: Mateu-Mestre, Marcos: 9781624650307: Amazon.com: Books Color and Light: A Guide for the Realist Painter (Volume 2) (James Gurney Art): Gurney, James: 0050837276277: Amazon.com: Books The above is the Framed Perspective book if you're more interested in books. And though color and light are about coloring, it helped me understand shading better and made my inking better as it helped me understand where to put highlights, etc. I hope this was helpful. Best of luck!