idk. I think if it is a PNG, there is no need to put the ".png".

i made 3 ones (the emotions and theyre pngs and ended with .png) and didnt work, i think they were too small

You just need to make three transparent faces and label them "hit.png", "scared.png" and "neutral.png"

Great question, its just easier for me

why does it have to be its own site

Just to be clear for everyone as even i didnt realize at first after you have added your images to the folder you have to rename them to "hit.png" "scared.png" and "neutral.png"