This is a great question, and it's actually nice to see something like this brought up to the Discussions board for a change. Our sourcing policy mandates that images be taken from Assassin's Creed sources only when these images are to be used in mainspace articles (as opposed to user pages). Aside from this, the images you uploaded were not properly named. While we're not strict on the formatting of the file name, they should at least indicate what the image is. Two images you uploaded today were also duplicates of another image we already have.
The image of the hieroglyph you found on Amenhotep III's article was uploaded back in 2011 when staff were much more lax about this policy. I have just removed it; thank you for bringing it to our attention. The other image on that article, while ultimately taken from a real-life source, was used in Assassin's Creed III according to the uploader. I cannot confirm this at the moment, but until I can, I will have to trust it.