Yeah, image is big but if your page don't have properly set metadata, it won't appear on special "aggregator" page https://itch.io/game-assets/assets-cc4-by. There appear only projects with cc-by4 license... In your case it isn't more about telling what license it has, it is more about placing your assets on page that allow easier search for assets with cc-by4 license...
I say to almost everyone who shares assets under CC license.
Why?
Do you think it is better not to do it at all? I use only free/libre assets and I would like just to open https://itch.io/game-assets/assets-cc0 or another "aggregator" link that show only assets with searchable license. But many of assets with these licenses don't have metadata so they aren't visible in those aggregator links... I am searching for assets and when I see something with CC license or something that looks like CC license or something that don't point license at all,I try to know what is the license and if it is CC license to say the creator how to add metadata
I don't like to search for CC assets by opening each page and read description to know I can't use this assets, and the next and the next and the next... If I open the "aggregator" link I can use almost every (because sometimes license pointed in metadata isn't equal to author expectations) asset listed there...