Category 1: I love the wings and feathers, as well as her hair and little trinkets.
The skirt (just the skirt part; not the bow and ribbons) seems a bit out of place in contrast to the rest of the design. Maybe just keep the ribbons and bow, and add in some little trinkets?
Category 2: I love the overall design of this one.
My only suggestion is to maybe add some bracers, or put some kind of design on the legs?
Category 3: Love every bit of this one. eue"
Only suggestion is to add more pretty trinkets/feathers~ <3
And another request; give one of the female entries a little familiar? Kinda like
Pina from Sword Art Online?