DireWerewolfGirl, as you asked, I'll post these as I finish them :) it may take a little while to get them all done though.
Here's your first NightWing! (The fractured shading is deliberate)
Your second NightWing (it's very similar, since you said they are twins)
Your golden SandWing/NightWing with black patches:
SCENE... THAT TOOK... YOU DON'T WANNA KNOW XDDDD
(When is this scene, by the way? I can't wait to read it XD)
Chill's reference
(Laziness? No.... No I'm working on the new OC haha...)
And lastly, the new OC, a Silk/RainWing!