Leviathan/Levi Hoffmeier (Fistful of Arrows) posted this sketch he did based on the concept art Bungie released in November. Check out his post on HBO...there is also a size for your phone background.
[url]http://carnage.bungie.org/haloforum/halo.forum.pl?read=1174152[/url]
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The character you just drew is actually called a "Dreg" according to Bungie's alpha build.