How would I be able to Texture this?

Hi! So im trying to make this mermaid fin as realistic as possible so I sketched a image of what I wanted it to look like. After I did that I tried to do it and it seemed really hard texturing with what I was following on this youtube video. Is there any tips or does anyone know how I would achieve this look with the fin? Here is what I am going for and this is drawn on, on an art app not actually in blender.
What I want it to look like:

What it looks like without texture:

What the texture looks like that we use in game:

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try uv unwrapping then moving each of the fins around on the texture until you like how it looks, if you haven’t solved this yet (use uv editing tab)