Being more realistic,
Let's see,
If you drew on paper that have no ledger lines, the price could improve.
My sketches go from 300k-2million.
http://i55.tinypic.com/bijvq1.jpg
This went for 500k.
So, I would price yours at 80k-200k.
Well, that's just my opinion so there might
be other people who would pay more.
Some people overpay when they really
like what you've done, so the price can vary greatly.