There are a bunch of places in the game where images aren't displaying properly. I took a look with DevTools and I've determined that the issue is the use of relative file paths. In some places, where the image's URL is calculated through SugarCube macros, it correctly prepends the gitgud.io main path, but in a number of places the URL is calculated through JavaScript code, and those are being passed back as relative paths without getting the proper prefix attached, so the browser is automatically assuming they are referencing hinsdaledays.itch.io as the base path. Ergo, no image.
For one specific example, in the passage "Daisy New Dynamics", Daisy's avatar at the bottom of the phone screen (next to the typing indicator) displays correctly, but her avatar next to each message in the conversation does not.