Yep, they're poster colors! Definitely recommend the book Anime Architecture for more details (and a lot more paintings like these): www.amazon.com/dp/0500294526
Anime Architecture: Imagined Worlds and Endless Megacities: Riekeles, Stefan: 9780500294529: Amazon.com: BooksAnime Architecture: Imagined Worlds and Endless Megacities [Riekeles, Stefan] on Amazon.com. *FREE* shipping on qualifying offers. Anime Architecture: Imagined Worlds and Endless Megacitieswww.amazon.com