Looks good. I might suggest you create more preview renders. Perhaps make a few renders under different lighting conditions, and show some close-up shots of the textures. Sometimes it helps to include at least one production render to help potential clients visualize the object in an environment where it might be useful. It's good to have at least one wireframe, but maybe include some from different angles too. It is also very helpful to sales if you have a "native" file format included with the model. If you created the chair in 3dsmax, Maya, C4D or Blender, those file formats sell very well and it will help sales if you include them in the downloads.