I think he looks great as always. The author stated he is pretty much re-using the sprites from Adastra here (with some new ones) so I don't know how you can say he looks different.
the new sprite looks a lot more consistent with how amicus looks in the illustrations in adastra, as opposed to his sprites. This is probably a matter of them being quite different in age, and haps getting better at drawing him over the course of adastra, which is to say that the one on the right is probably how amicus was always intended to look