Great ambiance with your use of lighting and stark contrast! I would wear this on a T-shirt!

The complementary colours and lighting are very charming on this piece. Excellent execution!

Very beautiful composition! I love the little personalities each Pokémon has, really adds to it all. My feedback would be to expand your contrasting light upon the Pokémon. The pokeball seems to be in a different lighting. Maybe a casting shadow from the Pokémon in front of it too.