Header has nothing to do with your content. It is good that you are using your own articles but you need to fill it up a little bit. You should activate the user-friendly-links feature of Wordpress from Settings/Permalinks. And your Category name is not relevant with the entries. Good luck.
I was impressed with design,background color schemes and contents but the header image is not suited for the theme and not very impressive to me..
as said before, header should be changed, but i like the colours used and the theme overall, its good and clean