I'll be honest, I wasn't too fond of Hiro's artwork of Otamaro, but the sprite doesn't bother me, and I'm sure the Sugimori artwork will impress me further; I'm sure it'll be like that for all of the Pokémon Hiro drew up.
Doredia has an interesting design that feels very Gen1/Gen2 to me. In fact, many of the designs are very reminiscent of the early days, and that could be why I like the new Pokémon so much. I'm anxiously awaiting a clear sprite of Enboo (the final Pokabu stage), as it was the only starter I wasn't totally sold on.