Hi--
I just glanced at your site, however I found a few more glaring issues that I would recommend changing. Granted you can weight my suggestions however you want.
The first and most noticeable thing is the ads by Wix all over the site. I recommend getting rid of Wix, finding a template (hopefully HTML) or hiring a designer. There are a number of pros and cons. Some of the pros include, a better site that is search engine optimized, less loss of potential customers due to exiting the site to Wix's, and ease of installing 'widgets'. The cons include: cost (of a designer) or looking similar to other websites (from a template).
However if you insist on using Wix:
Another negative is it is in Flash and Flash is a dying platform. Yes, it works great on personal computers (a couple years back it was like 95% of machines had it), but I can't load it on my iPhone/iPad/iPod Touch in addition to the loads of other mobile devises that are coming out, and although that may seem like a thing to poo-poo there is a general trend towards those so it might be worth worrying about.
It is also a very busy site, with the clouds always moving and the movement in the more info section (with the scrolling services). I might try to reduce that as it distracts.
Also, if I were to advertise using your service I would want to know more, and the site although it provides a lot of little tag lines, sentences, and phrases about it, it never tells me how you do it, how well it works, ect.
I do like your logo though and you seem to have a solid brand which is good for an advertising agency. 
Again I highly recommend making an HTML page, you could have a very similar site, but optimized, that runs on multiple platforms, without any ads and a better user experience.
Sorry for the bunch of criticism. I hope it helps a little.
--
Nick
--
Nick
Personal Website - http://nicholasquinlan.com
Vyactiva Photographic - http://vyactiva.com