Sounds like a good idea! But I'll also give you a choice: you can use that, or this old-style picture based on that sprite: http://bogleech.com/pokemon/allpokes/206-Umbreon.png
I'm not sure if you remember, but this beta version of Umbreon was supposed to be a Poison type and evolve from Eevee with a Poison Stone.
http://bogleech.com/pokemon/allpokes/206-Umbreon.png