It seems your armour is very stylized to the point of seeming to be only able to be used in a very limited number of fantasy style images. Plus it could stand with a texture map upgrade, perhaps making the horn elements actually resemble horns, and the armour more like metal. A variety of different ornamental etchings on the armour wouldnt hurt. Simply making it more versitile in this way, could go a long way to boosting sales. Right now it seems (no offence meant) very simple...and as such, people may then move on to the next "more ornate" offering. (mind you this is based on the link to the image you provided...I have not seen your marketplace pictures)