Mainly just putting this suggestion forward because of a skin/model I saw in the Customizable Player Models mod Discord, I think it'd make a wonderful fit with the mod considering that it's only 2D with no 3D aspect involved. I actually employed the same tactic when creating my own skin/model, and I really, really like the way it looks as the base one looks a tad bit restrictive… Could possibly be able to recycle the base wing region since that image is actually pretty long by itself.

Some reference images:
— My Sona:


— The Original Design:
https://cdn.discordapp.com/attachments/811531643448983593/1135007792202268742/Minecraft__1.18.2_-_Singleplayer_2023-07-29_21-02-28.mp4