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My main point would be to add color. There is very little else that turns me away faster than black and white. You're selling design, show it. Vibrant color gets attention, it is what clients want, so show that you know how to use it.
Links on the header could be increased in size, probably to the size you have "DAVID" in on the logo. The footer could also mirror the grid from your main section. Having a black background is okay, but you may want to change it to match color from other areas.
Otherwise, it is a clean design. Increasing font size will allow for easier reading and color will stand out much more. Before release, do make business accounts for Twitter and Facebook though.
