It looks really nice! As you say, you could probably use some carving practice. Your stitching looks great, though.
As for price, that's kind of a loaded question. When I make mistakes, I just subtract a little from the price and sell it anyway. I think you just have to decide on what it's worth to you and try to sell it. You can sell it for a higher price (by $100, I've heard) if you can sell in person, say at a craft fair. I sell all of my leather on etsy, and it's much harder to sell things to people when they can't handle it. So much to say, with the tooling (which increases the price), the really nice hardware, and the nice stitching. . . I would charge $200.00 - $250.00 for it. Some people might say that's high, others might say it's low.