I blame either your targeting keywords that are far too competitive or there is a technical issue on your site such as denying google robots or something. To give you an idea of the impact the keyword competitiveness makes, I launched two sites about 18 months ago, the competitive one I pushed hard for a long time buying links and 1 article per day, I've not bothered putting ads on the site as the traffic is still so low so you've actually beaten me on this one. The other site is far more niche and less competitive, I've only put up 1 article per week, not bought any links or done any promotion and it makes about $50 per month with the little traffic it receives but it ranks well on lots of obscure keywords. Just like me you need to find something that is wide enough to deliver good traffic but not so competitive that people will actually see your site on Google.
I worked with Adsense + Pinterest. No unique entries. Quick start - 1 week - $5-10 per day. But Pinterest is crap. THEIR supports are shit! They slapped me with a ban on both the account and the site for spam, despite the fact that according to the rule there was no spam. So be careful with Pinterest, their crap algorithms can destroy you at any moment.