Colour theory for the traditional painter and/or illustrator. This is what I use.
Bobbie Burgers‘ gorgeous abstract-ish floral paintings will have you wishing for peony season sooner than later.
5 Cool Art Studios That Inspire Me More
Little Bird 2 Painted with Indian Ink and Watercolour by Abby Diamond.
Landscapes Painted on the Surfaces of Cut Logs by Alison Moritsugu
Narrative Optical Illusions Painted by Rob Gonsalves
Hazy Black Watercolor Paintings of Children with Animals by Elicia Edijanto
"To be a great artist, you must have a devil inside" -Voltaire
International Illustration Competition winners Japan Illustrators' Association