Concerning some of the Power Instinct images.

I have some better quality images in comparison to some of the "fuzzy" looking ones in there, particularly a few of the Groove On Fight images, and I'd like to upload them, but I'm not sure if my requests to have them flagged for deletion will be heard. I was just wondering if I could do something about them, if that's fine. If not, I'll understand.

I apologize in advance if I've imposed by asking this, and if I come across as a total newbie.

You shouldn't flag the existing ones for deletion, you should upload hte better versions and then make the new ones parent posts to the old ones.

Hmm... is that how it goes? I'll try and remember that when I get around to it.

If anyone else can provide some insight on this, please feel free.

That is indeed how it goes. Duplicates are pretty common on danbooru but they're fine to upload when they're higher quality than existing images.

To use the parent-child system, take the post ID of your new images and put them in the parent field of the old lower-quality images after clicking edit on the lower-quality post page. Hope that makes sense!