Forum:SH:Mace Windu's Concept Art - correct image?

The image on Mace Windu's Page that says it's original concept art of him, is this actually an early image of Mace Windu or is it something else?

The actual name of the image is:

'unknown dark sider adept' however it is in the Mace Windu 'character concept' section.

http://starwars.wikia.com/wiki/Mace_Windu?image=UnknownDarkSiderAdept-JPG

So is this an unknown dark sider image or is it actually concept art for Mace Windu? I'd like to think it's concept art for Mace Windu myself - feels light sider to me!

Thank you - Mace Truth!