Whatever someone is willing to pay for it.
Vincent Van Gogh once said, "I can't change the fact that my paintings don't sell. But the time will come when people will recognize that they are worth more than the value of the paints used in the picture."
Sadly, that never happened during his lifetime.
start by doubling your material costs (to account for the material used and the need to purchase the replacement), then determine the value of your time (realistically $10-$20 per hour for an unknown artist)...
....add it all up and put it on a price tag... if people balk, consider re-evaluating the value of your time, if not the level of your talent...
$1,000,000 and up
If it's as good as your questions, you can't give the crap away
Take it to an Art gallery to find out.
You need to ask your local art galleries to know how much they are willing to offer for it.
It depends on a lot of factors. If your art work is bad, nobody would buy it. It would sell for zero dollars.