Hmmm...the font in the header looks a bit wrong. Perhaps try a different font? Its a window tinting company? Why not try a strong font, a nice bold one? Try making the letter spacing a little smaller aswell, and use a sans serif font for the tag line.
The red against the black is quite good. It might look better with more content!
...Just my opinions
[edit]
I misread your post, I thought you said that you can't decide whats wrong with your header.
Well they do seem a bit chunky. Perhaps try and make the red backdrop smaller?