If you have good smart phone having good picture quality then you can click the historical or nature pictures or the one which are in demand and using some editing application you can enhance those pictures and promote them. You can easily sell them at your own fixed price. "Foap" and "Dreamsite" are the mobile applications that offer the same service.
The quality and service of your website are as important as the advertiser’s website. If your visitors become unhappy and dissatisfied after purchasing the product you advice, they think nothing of taking your advice, again. I mean it hurts your credibility. So, focus on choosing the ones that offer good customer service while promoting the person or company.