The recent test drawing was a big help because it made me realize that plopping a canine head onto the wyvern didn't work. So now the head is this. More stylized and a trickier angle
Replying to @volpeon@icy.wyvern.rip
@volpeon Re-uploading my colored pencil version of this with permission. (Anyone seeing this, make sure to check the post above for the original!)
Volpeon 

