Kind of like a new Rolls Royce, if you gotta ask the price... hehe
But seriously, you have a unique tallent and that work is way time consuming. I can see someone paying upward of 20K, especially considering the staircase probably ran double that or more.
Wow! I've been thinking about doing a medium sized asian symbol on a wall using spackle and then highlighting it with a clear pearly paint but this is amazing!
I can't imagine how much time this must take!
Beautiful work!