This sprite looks good, but it seems a little too short for me. But I guess it's fine, since Silver is younger in Acanthite.
EDIT: It seems short because the hair at the top, where the spike starts, becomes flatter instead of round.
Looks good, but I noticed, like Kyle, that the bag is in front of his arm. The spike in his hair looks strange (like an error). His right arm (our left) seems too narrow-shouldered. Silver hair looks like it got shocked on the side, or wind is blowing at him, which is extremely odd-looking. Lastly, I dislike both of their faces.
EDIT: I just noticed noticed on these two larger Willow and Silver sprites that they do not have a SINGLE black outline excluding Silver's shoes. That just makes it less of the D/P/Pt style. Also, the shading and outlining is quite bad.
I don't like this sprite so much. Silver's not the kind of guy who I can imagine doing this pose, and now that I'm seeing it, it looks very abnormal. And the arm proportions seem strange to the opposite arm and the body and legs. The head and hair looks like a rip off from the male Cooltrainer in Pokémon D/P/Pt, and it's badly shaded and/or outlined. Lastly, it shows that the spike in Silver's hair is facing
left in all of his other sprites, but in this sprite it is facing the right.