From Bulbapedia, the community-driven Pokémon encyclopedia.
One of Komayama's illustrations
Akira Komayama (Japanese: こまやま明) is a freelance artist who contributes illustrations to the Pokémon Trading Card Game. Akira spent eight years working as a designer for a game company before going freelance in 2009, and currently resides in Tokyo.
For a complete list of cards that Komayama has illustrated, go here.
TheFreeWorld Akira Komayama's website (Japanese with some English)