You have a nice site, focused on a niche-topic. But I find that the site is quite new. Not even six months old? I guess the domain is also not six months old? That might be an issue even though you seem to have a decent number of posts in there. Try to maintain a minimum word-count of 400-500 words in your posts (some of your posts seem to be slightly shorter) and try to write some pillar articles (in excess of 1200 words) occassionally that can bring in some decent traffic. Traffic is also an important metric they use while evaluating.
Also, next time when you apply, try removing those Infolinks ads while applying (temporarily). You can always add them back later on. But do think if these ads distract your readers, before adding them again. During the initial stages, your revenue won't be considerable. So, don't worry too much about monetization right now. Focus more on user experience/traffic. Add an email subscription option to your blog (you can use feedburner.com for that).
I am no expert, but these are my suggestions.