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model: Pigeon Feather (Realistic)
The Vane of the feather is made through Photometric Stereo Scanning, a simpler type of photogrammetry.
With this technique I captured the albedo, translucency and normal map. All other maps are generated through Affinity Photo and Materialize. The textures are approximately 4K (4186 x 2757px), so it's suitable for extreme close-up renders of this feather.
The After Feather / Downy Barbs are made with Geometry Nodes, so it is fully procedural and can be adjusted to your needs.