You're willing to pay 10$ (symbolic payment at best), also, the very first definition of job is "rewarded effort", and you're asking people to put an effort for a reward that might or might not come.
What you should do, if you're lucky enough to get someone to open photoshop for 10$ (I know I wouldn't), is to ask for bids, check the portfolios of the people who bid and then pick one and give him the job, so you don't waste the time of those you don't pick.
ok i try my best to explain. think of google or Facebook logos, they are developed in length, so we can say they are in an imaginary rectangle. now thing of apple or microsoft logo, they are in an imaginary square... hope i made sense