Hi Heather
No, it certainly isn't against the rules (if it was 90% of the photos would never get posted as the majority are scanned incorrectly

), but obviously it is easier to work with better scans but more importantly, you get a greater quality image and print. The problem with this type of file is (ie .jpg), every time you download, email or save it, it compresses which reduces the number of pixels in the picture and therefore the quality (the more pixels a photo has, the better the colours, detail etc) so ideally, you want to start off with the best scan possible.
Also, my advice to anyone would be to either download their restored pic and save it as a .tif file as this type of file does not compress.
Kind regards
Caroline