Looks great! I think your material choices sound really good - I'd say for the squids fins and suckers, go with the white MOP for the chatoyance & to compliment the whale, I imagine the glow in the dark epoxy wouldn't give you that. I think perhaps that one squid arm could be a little bigger/thicker, the second one down, just my opinion! I think it looks great, but, I'm partial to giant squid attacks. Maybe green abalone for the squid's eyes...maybe you could make each individual whale tooth out of bone lol