There is an archive of all pictures Q has posted, in addition to those in posts Q responded to here:
https://postimg.cc/gallery/29wdmgyze/
It includes all of those back to the very first Q post, and includes ones that Q has posted multiple times (like the US flag) - so it's in there separately each time Q posted it.
These are delineated on the spreadsheet for each Q post - giving the original link and the gallery link (8ch/8kun archives & archive.is only save the thumbnails - the full-sized photos are in this gallery)
I don't know that the images Q has posted first are nowhere else on the internet. Once posted by Q people can then repost them elsewhere, but this gallery holds all of the pictures/graphics/screenshots Q has ever posted.
I hope that helps. Archives are there for you whenever you want or need them.