Couple quick thoughts:
Nice clean design. The slider does a good job of conveying what you do. Are all the pictures of your projects? One or two of the pictures seem a little blurry- but the rest are good.
I am guessing that you are still fleshing out the content- it seems a little light. For example, your "About" page could certainly tell us more about you.
Trust. More pictures, including one of you, and more detailed explanations of your services will help build trust.