I don't know your work and to be honest, the quality of the work is actually one of the lesser contributors to what something will sell for, assuming it isn't an ugly hack job.
There are a few universal truths. You can come down, but you can't go up from the asking price. Marketing is the single biggest factor affecting price. A top quality written, extensive description, see TOW for great examples, along with quality pictures with sharp focus that are properly lit are the key minimums.
Putting it for sale in front of the right audience makes all the difference. Not to deprecate the members of this forum but there don't appear to be very many multi-millionaires on here. To most on here $5,000 is a LOT of money, to a millionaire it is pocket change and is well within their impulse buy zone (I like it, I want it, I buy it. No further study required). Many of the members build their own, most have come across unbelievable deals, and most know intimately the price of parts, and have study the works of masters, so we are generally the wrong target audience to extract the maximum price from.
To get the most money for what you sell, sell it where there is large interest and very well healed buyers. It is why Christie's Auction house in New York, Geneva, Hong Kong gets far higher prices for what they sell than the local Phoenix auction would ever realise on exactly the same item.
The final part is being willing to wait to get the price you want.
I will rarely negotiate much on stuff I am selling (I set what I believe is a reasonable price for what I am selling and am not prepared to sell below that, but I also don't need the sale money to live on or buy the next project). I will always negotiate on things I buy because most people list high expecting too come down, some as much as 60%. I believe this to be a poor marketing strategy in the long run. It is similar to what retail has done in teaching consumers to never buy anything unless it is on deep discount sale.
Let us know how you make out.