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very nice model, id recommend improving your presentation images though. Increase the samples in your render settings to reduce the amount of grain in the ambient occlusion renders. When doing wireframes, use contrasting colours (white model, black wireframe for example. This allows the customer to see the topology easier than the grey model/ black wireframe that you have at the moment. Id also suggest doing a textured render as you state in the details the model has textures.
As for model improvements, rigging a model like this well improve sales a lot.
