Dunno if this post is still being updated but Some channels to add would be

Robert Marzulo - Teaches drawing and digital painting in Photoshop, CSP, and Procreate (Link: www.youtube.com/user/MrRamstud… )
Neil Fontaine - Teaches drawing and digital painting in Photoshop, and CSP.  Both are also comic artists.  (Link: www.youtube.com/user/architect… )

For photoshop check out Marty at BlueLightning TV. I learned a lot from his channel and occasionally still go there for specific things. (Link: www.youtube.com/user/bluelight… )

Glad to see Phlearn on the list. It's a great channel.