Improving several t-shirt designs

Hi, I have an established t-shirt business I'm planning on selling. There's several designs that I'd like to improve/edit beforehand in order to maximise profits. I've uploaded the designs for editing and any freelancer can submit his work. The best designs will be selected and I'll award $100 to each design that is chosen. This price is based on the condition that payment will be awarded after I sell my business. The price is high because of this condition but for each freelancer that submits a successful design I'll provide full details about my business. I've worked with many graphic designers from freelancers in the past on similar conditions and have a I trusted feedback score. There's not really any particular design style I'm seeking, but you can be inspired by sites like [login to view URL] and bustedtees.com. There's also some minor alterations I'd like to make for a few more t-shirt designs not uploaded but will contact participating designers with the details. Thanks! Marcus