First thing to say: I like the art, A LOT!
I have a small comment, though: each of the characters should represent a certain element. Ace and Lily are "Death", right? So where are the references to Death in Ace appearance? I can definitely see it in Lily (grey skin, "corpse-bride" style...), but not really in him
But this is just a small remark, overall they are both awesome! :D