Thread:Merrystar/@comment-4770882-20120619151040/@comment-11001-20120813024800

You can customize the description of your wiki at MediaWiki:Description and the text displayed at the top of each page at MediaWiki:Pagetitle

I have never seen anything added to images like you describe; I suggest you ask either in the forums or at Special:Contact. In general I have to admit I have the opposite problem -- when I search for new images for my wiki the results are flooded by on-wiki images!