"Jamie's Got Tentacles" by Samka Productions Gael BECU (background paintings) Thomas GREFFARD (Backgrounds design)
This series of illutration / painting is signed by the author and illustrator French Yvan Duque.
Susurro - Ilusión óptica
More Color Studies by AnthonyE
Seagazing by Benjamin Flouw, via Behance
Eyvind Earle. 1950s Disney background artist and painter... http://www.gallery21.com
Color and texture study, Lina Porras on ArtStation at https://www.artstation.com/artwork/color-and-texture-study
Tibor Nagy I really like the expressive strokes while somehow still capturing an amazing amount of detail.