[ramtam]

If I consult with a flat fee I will include an amount of revisions allowed, any revisions beyond that point is billed at my hourly rate

I prefer to use an hourly rate if I am creating artwork for a project from scratch, that way it puts less pressure on the client about worrying about making changes - hourly fees for me are more for clients I feel would like to explore many creative directions and flat rates I reserve for things that are very straight forward or can be subcontracted out with very little direction.