Good day!
Very interested in this question. Why there are no fields in suggestion form that can push such request? For example, I have better icon for https://lutris.net/games/medal-of-honor-underground/
How can I donate it to you? It may be a good idea to create a separate thread of the forum where users can share their screenshots, icons, banners and other things, and the moderators will take pictures from there as necessary.