It's okay. Clean, simple, very basic but at least not hard to read. I would suggest adding separating elements, though. Right now, the page is all white and there are no separators for the article section and the archives section.
It's pretty simple which is probably good in this case. I'm assuming this site is designed more for Search Engines than Humans, and on that basis.. it's good.
All you did was create a Wordpress with the Twenty Eleven theme and made a custom header. So I wouldn't say you "designed" it. Don't mean to be rude, but anyone can do something that simple. Try making a custom theme from scratch next time.