(1.8.9) Custom Texture Pack creation: Texture pack being recognised but textures not showing up

Heyo! So, I decided to create my own texture pack for version 1.8.9. I setup the file structure and changed the bed texture a bit. It should change the red bed sheet to a mint to aqua gradient, but for some reason it doesn’t appear?

Here’s the file structure with the size of the pngs between brackets:

assets
L minecraft
  L textures
    L bed_feet_end.png (16x16)
    L bed_feet_side.png (16x16)
    L bed_feet_top.png (16x16)
    L bed_head_end.png (16x16)
    L bed_head_side.png (16x16)
    L bed_head_top.png (16x16)
pack.mcmeta
pack.png (500x500)

Here’s a screenshot:

Here are the contents of the pack.mcmeta file:

{
  "pack": {
    "pack_format": 1,
    "description": "Hukyfi's Minty Aqua Texture Pack (v1)"
  }
}

This is all compressed into Hukyfi's Minty Aqua Texture Pack (v1).zip

The game recognises the pack but doesn’t load the pack.png thumbnail.

And when I get into the game, the bed texture hasn’t changed:

I tried unzipping other texture packs to disect and check if they had done anything differently but it doesn’t seem like it.

What am I missing? or did I do something incorrectly?
Thanks for helping me,
Hukyfi