Well, currently AO3 hasn't had the capability to host images yet, since it's related to server space and day to day operational cost. This is why AO3 hasn't hosted fanarts yet.
Oh, and by they way, what do you mean by making the site look newer?
For what it's worth, the ao3 website is pretty easy to restyle if you want to modify it to better suit your needs. There's the inbuilt skins you can use to set up dark mode and similar as a user FAQ here: https://archiveofourown.org/faq/skins-and-archive-interface?language_id=en#change For non-logged in users you can use a script or a program to change how it looks on your computer and then use a userscript. Some of the userscripts that have been designed by other people are here: https://userstyles.org/styles/browse?search_terms=archiveofourown.org&type=false (You can use this with Stylus: https://en.wikipedia.org/wiki/Stylus_(browser_extension) )
You can also use the skins to hide certain types of tags and similar.
Comment on Updated Collections & Challenges Help Documentation
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