There are 2 ways to do this. The easiest way is probably to just add some space at the top of your image, which will make it appear in the middle (of the top and bottom of the header).
The other way is to add padding to the top of the .head-wrap class and then decrease the top padding on the nav links.
Add this to your css for the .head-wrap –
.head-wrap {
padding: 10px 0 0;
}
Adjust the top padding in your css around line 3110
.genesis-nav-menu a {
border: none;
color: #fff;
display: block;
font-weight: 400;
padding: 0 13px 13px;
position: relative;
}
That would give you this result – http://i.imgur.com/L7rq0oV.png