I have no idea, but August was indeed a very poor month for me there.
A question: what is bounce rate? I see that in Google Analytics and don't know.
Its the percentage of visitors who get to your site, only look at one page and then leave again. A lower number here is good.
I don't think the percentage of visitors from search going down is necessarily a bad thing. I'd rather people went to an agency knowing where they were headed because they're regular customers buying images rather than random low-value traffic from google.