Can anyone help me figure out why the mods dont seem to be working for me?

Here's what I did:
->Downloaded the .png file I wanted.
->unzipped it into a folder that I created specifically for mods.
->went into VV2 image folder and created a new folder called original backups
->moved the carrying.png file from images to original backups
->moved mod file into images folder and renamed it carrying.png
->closed the folders and launched the game.
Alas, my mushies are still brown....

If it matters, I was trying to use Charley's mushroom mod #3 found in the link in the 6th post from the top here
Game mods thread Thanks