Not a bad artwork per se (Seviper doesn’t have any bad artworks 
), but I never really liked the pose of Seviper in this artwork, and there also isn’t much going on with the background:
And although it’s not in my top 25 favorite Pokémon, as a Pikachu collector I had to choose my least favorite artwork for it as well of course, which is the Japanese blue background Pikachu World Collection 2010 card. The other eight Pikachu cards in the Pikachu World Collection 2010 are more dynamic in both pose and background, and also all have the language’s flag incorporated in the artwork. Because of that, the Ken Sugimori Pikachu with blue background is just lazy and not really part of that same set imo. (The green background version I don’t mind that much, since green is my favorite color.)
Greetz,
Quuador