Thread:RighteousClaim/@comment-6697950-20160216152437/@comment-6697950-20160216160619

Unfortunately, that looks like a fan-made wiki, so it doesn't count as an official source. It can be used as an intermediate source (i.e. you can get the image from that site if it has higher resolution for example), but you must still provide a reference to the original official source. An official source would be Dengeki Online or the official game sites or official SAO social media accounts (like Twitter) and anything of the sort. If the image isn't sourced to one of such sites, then it cannot be added to the article, even if it clearly is an official image.

Concept art of characters is put under "Character Designs". Everything that's not a design but comes from source other than the LN/manga/anime/games themselves go under Extras. Draft illustrations (e.g. http://swordartonline.wikia.com/wiki/File:Volume_9_coloured_scribble_by_abec.png) go under Extras.

If you need help figuring out where a specific image should go or have any other questions, just message me and I'll help you out.