Some great comments here so will try not to repeat what has already been said. I will say that 55% bounce rate is nowhere as bad as you might think although there is still room for improvement.
Here are a few thoughts:
Seek to understand how others view and use the site. You could try using http://www.trymyui.com/site/home to get video feedback and survey responses from real people testing your site. In addition, adding Click Tale code to view actual user activity may also help. That would get you some real world feedback.
To give my honest personal thoughts and feedback:
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The featured image slider is too large - I don't want to have to wait to see all of these to figure out what you do
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Your homepage content is too vague - what services do you actually specialise in? Graphic design, web design, SEO? Make the core service offering more obvious from the homepage
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Design elements such as 'Our Methodology' down the side and some other imagery looks a bit dated and 'stock photo' like which was a big turn off for me. I probably would have been in the 45% bouncing off just based on this alone.
Take a look at this agency site http://www.scamperbranding.com/ - the design is clear, conveys what is offered, provides a call to action and clear path to conversion.
- Internal pages are very text heavy and should be broken up with clearer formatting and better examples of your work. For example, on your branding page I would expect to see clear examples of your branding work.
Hope this helps.