Halloween // Help me make my costume better!!! (avatar)

So me and my partner are going as captain mick scoresby and a tulkun from avatar way of water for Halloween as a big inside joke of ours- we’ve got him a pretty good outfit for him when he’s on one of the boats with his robotic arm and then I have a big grey shark onesie because I wasn’t able to get a whale one in a darker colour which looked better!!! what could I add to make it more tulkun like, down to try anything! just don’t have any creativity in my brain right now :,,,(((

Please help!