Mateusz Urbanowicz
Mateusz Urbanowicz is an illustrator currently living and working in Japan. He creates background art for animation and occasionally creates interesting theme projects for himself, the latest being a series of watercolour artworks on Japanese shopfronts.
He also has a Youtube channel that features some tutorials where he talks about his process. Check them out at https://www.youtube.com/user/mattjabbar/videos