Character design concept art

We are looking for 3 character concept sketches in the style of team fortress 2 (http://www.tf2.com/artwork.php)
A stern manager in a suit.
A dopey old oil rig worker in a boiler suit.
A flamboyant tv game show presenter.

These will be used in a game proposal.
The deadline is next Thursday, the 17th of May

If our proposal is successful, your concepts will be brought to life as characters in a game and you shall be listed in the credits. This game is a new method of presentation to be used throughout a large company, one of the Fortune Global 500, so your name will have some extra publicity.

We cannot offer you money just now but if we win the contract we will be able to pay you a fee for the work.