Seems like a light adventure game and the painting theme is more window-dressing than requiring actual painting on your part, which is a little disappointing.
http://www.eastshade.com/
https://store.steampowered.com/app/715560/Eastshade/
Eastshade Studios wrote:You are a traveling painter, exploring the island of Eastshade. Capture the world on canvas using your artist's easel. Talk to the inhabitants to learn about their lives. Make friends and help those in need. Visit cities, scale summits, unearth mysteries, and discover forgotten places!
Official Trailer 1.1: https://www.youtube.com/watch?v=FHPWlZYTNNg
February 13.