I\'ll put my two cents in. Some agrees with what\'s been said, some disagrees.
The photo:
It\'s too dark. It needs to be brighter since details are pretty much lost in shadow as it is. The front picture needs to be on top. Better yet, put the front and back shots side-by-side so people with low resolutions don\'t have to scroll the page to see the full figure.
The auction listing:
Make damned sure Warhammer & Painted are in the title. Since this is an old figure, OOP needs to be in the title, too -- you want to attract the Citadel collectors to this auction, so I strongly disagree with dropping OOP from this one. Drop the whole \"painted by a demon winner\" thing and mention that in the listing itself or as a subtitle. The terms \"Chaos Warrior\" are broader and should be used over \"Nurgle Champion,\" but only drop \"Nurgle\" if you\'re running out of title space. Do not use \"pro\" in the title; it\'s worthless as is any indication of the quality (\"well painted,\" \"awesome\", etc).
Being low priced, OOP and in an unusual colour scheme (at least for nurgle), your target audience should be roleplayers and collectors. Mention in the listing how this could be used as a vermin lord villain (or other class) for D&D or RPGs; give your viewers ideas for additional uses for this figure. You may even want to risk putting RPG in your listing title, but don\'t add D&D to a Warhammer listing -- ebay does occasionally remove these since GW\'s IP restrictions states their figures can\'t be used for D&D.
Shipping actually isn\'t that bad, assuming you\'re packing it extremely well (IE, cardboard box, foam rubber, insurance). If you\'re doing all of that, mention it clearly and proudly in the listing. If you\'re not, then you need to drop your shipping rate.
Add a reasonable Buy-it-now price. It\'s only 25 cents extra (at least on the US ebay) and does two big things: It gives you a chance of an impulse purchase and it encourages early bids (some folks bid early purposely to get rid of the BIN option and hope it sells for less). Do not \"require immediate payment\" with the BIN.
It\'s too late to worry with the base unless you want to spend more time working on the figure (which I don\'t recommend -- you\'re already behind as it is, so use that time on another figure). If you\'re targeting 40K players, D&D or RPG players, or collectors, a round base is fine. If you\'re targetting only Warhammer players, it should have been on a square one.
Individual troopers are always harder to sell as singles than characters, and OOP figures are always harder to sell painted than newer. You have two things going against you right off the bat. Still, I\'m confident your major problem here is the title (or rather the lack of good keywords in the title).
Anyway, hope that helps.
Kep