The grey bars down the left of lists look like they're supposed to be something else, but haven't rendered. The form on the contact page looks a little funny, maybe space it out more and change the colours. Everything else is nice.
The black footer bar looks a bit odd, like Adam H said make it stretch out like the header.
I would also change the word 'samples' in your navigation bar to 'portfolio', I think it gives more of a professional image.
Also I think the font is a bit small, maybe you should increase its size or try a different font all together.
But I think with a bit of improvement, it could look really nice and professional.