I'd say for cases like this just link the original comment like you usually do while making a note of the games and/or characters they have portraits for, rather than trying to link each individual portrait. If you want a single link to download everything at once, just link theIs it possible you package all you've made into 5 downloads or so? The post where I catalogue all portraits is becoming unwieldingly long otherwise.
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page, all of their portraits are attached to that and you can use "Code > Download Zip" to download all of them at once.