Cool that you sell this!
I think it should be possible to sell a model like that, and I have made a few of my own during the years when I worked with furniture design, so the following is my honest response to the model and the way you present it so it would reach me in a manner that I would be willing to pay for it.
My advice would be to redesign the head to a simpler shape with no eyes and less nose/cheekbone.
IMO it draws attention away from the design of the object that it is there to support.
Also the head seem to rest on the shoulder with little neck, and a 90%tile man has a neck, so it should be as physically accurate as possible to draw customers. And work on those poses, make it look like it is easy to arrange it into a natural pose. I don’t know anybody who walks with their hands like that so why would any customer be interested in posing it that way? IMO they would be interested in posting it in the most flattering way possible.
These days I work with landscape architecture and the models of my choice are these:
(Untextured, downsampled versions of 3D scanned people)
(I just rendered them with two rectangular lights in Raytraced display mode)
And the reason I like them is that they are the right size, they portray people with emotions and at the same time they are not detailed or colorful so they draw attention away from the design.
I hope that inspires you and ALL THE BEST!