I've been an indie video game developer for 5 years by now, thus I've worked in various sectors of video game development, including graphical design, level design, and tileset design.
As a video game developer, not only I have graphical designs, but I also acknowledge how they can be used in the games, such as making each part of the tileset, for example:
-Centre, top, bottom, left, right, corners, slopes, under-connective slopes.
As well as knowing about graphical design in a data-environment, I also acknowledge the visual-environment as I've also worked with projects in which they have fields and forests, in a ranged-set of art-styles, and also some art-styles similar to the one you're requesting.