Nice looking knife. Looks like you could use more sanding around the pins. I've found that putting tape on the scales when I drill the holes out helps keep the scale from breaking out at the ends. Also if you just put a slight taper on the end of the pin before you feed it through it will help to not catch on the edge of the hole. As a personal note, I would have backed the scales up a little farther from the bevel, but that's no big deal. I like walnut. It can be an atractive wood after finishing. There really isnt anything wrong with your knife, the shape is awesome. But you probably want to focus on asthetics if you want to sell it. The rustic look of the blade is a great selling point, and I think walnut is a great compliment. The handle is a little long for my taste. I like my handles to extend just past my pinky finger.
I feel like I am dumping on you, and that's not my intent. I just want you to be successful and be able to get the maximum dollar for your work.
Hope my comments have helped and not upset you.