I think it could also be per job. Some of the drawings I've vectored were pretty quick, like just a few minutes. So that could equate to just a dollar or two. Other drawings have taken a few hrs as they needed to be cleaned up. So generally you could look at a drawing and if it looks like it wont be too hard, then charge $15-20. But if it looks like it needs alot of cleaning, then maybe charge by the hour.