The CosmicBeholder's Cameo Piece

Some doodles and sketches inspired by public domain characters and the drawings and OCs of DA pals
and
Can you name them all?

My dA Buddy, The CosmicBeholder, made an amazing sketch featuring OC's from the artist listed above. I asked if I could finish his sketch. He allowed me the privilege and this is my endeavor. Hope I honored you and your talent my friend. It was very fun to do. Thanks very much for the privilege.

Earth-K, Anna Atom, and Max Atom were created by Michael P. and are available for use by anyone, with only one condition: This paragraph must be included in any publication involving Earth-K, Anna Atom, and Max Atom in order that others may use these properties as they wish. All rights reversed.
The character of Jenny Everywhere is available for use by anyone, with only one condition. This paragraph must be included in any publication involving Jenny Everywhere, in order that others may use this property as they wish. All rights reversed.
Moon Girl is a Golden Age heroine who had fallen into public domain