The folder structure is as such
github/hgame-art/game_name/artwork.png | jpg | jxl | gif
A jpg version is made available in regards to file size in the case of network restrictions where smallest possible size is prefered.
The gif is purely optional and only exists if someone wishes to go above and beyond when creating the artwork, it has the biggest file size of the 3 provided formats, and is not guaranteed to exist.
File conversion is done automatically to JPG and JPEGXL formats, so please provide the files as either PNG or GIF formats only.