The enhancement to change Link's sprite has been added through zspr files

step 1: download snesrev's sprites-gfx repo by typing git clone https://github.com/snesrev/sprites-gfx.git

step 2: place sprites-gfx folder inside the root of the zelda3 folder

step 3: open zelda3.ini

locate the section that says

# Change the appearance of Link by loading a ZSPR file
# See all sprites here: https://snesrev.github.io/sprites-gfx/snes/zelda3/link/
# Download the files with "git clone https://github.com/snesrev/sprites-gfx.git"
# LinkGraphics = sprites-gfx/snes/zelda3/link/sheets/megaman-x.2.zspr

as mentioned in the second line you can view sprites on the website then update the ini to read like this example

# Change the appearance of Link by loading a ZSPR file
# See all sprites here: https://snesrev.github.io/sprites-gfx/snes/zelda3/link/
# Download the files with "git clone https://github.com/snesrev/sprites-gfx.git"
LinkGraphics = sprites-gfx/snes/zelda3/link/sheets/minishcaplink.3.zspr

click the sprite on the site to get the correct file name to replace Link with what you want.

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Want to make your own zspr file?

download ZSprite https://github.com/sosuke3/ZSpriteTools/releases/tag/1.0.76

click File> Import> Sprite From Rom

you should see this:

click File>Export>PNG

edit your file

when finished open ZSpriteTool again

click File>Import>PNG

then File>SaveAs