With Murderers, do the wings actually attach to the arms and legs, or is that just a rough guide to the size?
They do attach with the Arms, not the legs though.

Also, what sort of dog do you want stood by your character?
Husky I guess.

What sort of tone is the skin on his face
They have Pale Blue Skin

And does your character have hair, or just feathers on his head
Feathers. But they make a shape like hood.