Quoted From: James Cameron

You recently posted some artwork of a supposed Na'vi character. Don't know where you got it but it's spurious. I've never seen that piece of art. We had a lot of free-ranging conceptual stuff in the early days of design two and a half years ago, and it might be something that was done then but not shown to me, but it is definitely not remotely our actual character design. Aside from two legs, two arms and a tail, it doesn't have any features in common with our final designs. If I had to guess I'd say it's a piece of fan art based on the description of the Na'vi from the old treatment which was leaked twelve years ago. That description is obsolete relative to the shooting script, since things have changed a lot over the years.