There comes a time in every players career where he or she must depart with their dearly beloved marker. Putting your gun up for sale in the Buy Sell Trade section of forums such as TechPB allows a faster sale then local classifieds.
Taking a good picture for your B/S/T thread is more than just laying the marker on the ground and snapping a picture with your iphone. Take ten or fifteen minutes to properly light the room and clean your marker. Take a lot of photos with different camera settings and then choose three or four of your best shots. Adjust the levels in photoshop, and if need use the healing brush or blur tool to remove shadows.
A good photo communicates to potential buyers that you have a good product, and that it is taken care of.