Very cool scene, OP! I love the underwater enviroment. Did you use the fog primitive or clouds to create de atmosphere? I suggest some caustics map at the light cones gel. ;)

Here's the first try with the bird wings:

Bird Wing - Round 01

The wing has 3 morphs, at three sections of feathers: tip, middle and shoulder. I see some overlaping on the feathers, but I thiks it looks ok. I'll try with the arm, now. Let's see what I get. :)

Congratulations again for your nice job!