Looks good! If it's not too much of a hassle, care to give it a go with
this color scheme for the gear? Most of those colors are already part of Seviper's base colors, more or less, so I was thinking of using mostly only complementary colors for the outfit, namely playing with brown/red (fabric) & green/yellow (feathers) for sort of a jungle mayan feel... or used in whatever arrangement you feel works best with that.
A minor detail, the yellow of Seviper's jaw should go just a bit further, essentially filling the two small black "boxes" left right below the 4th feather.