I like it a lot, you need a type of banner, or something to hold the camera. It looks like there is to much empty space at the top.
Try this: move the photograph of the camera to the right of your logo so there's not a lof of blank area on the right of your header.
Create a review of each camera. Provide lots of unique photos and if AT ALL POSSIBLE purchase the camera and review it or find someone else who has it to review it. Real reviews do great. Nice descriptions of each camera with comparison to competing models would also be good. For example the Cannon XT to the Nikon D70. Compare whats best about each. This info is pretty easy to find. Provide news on cameras that will be coming out, preferably before most other blogs find out.
Design is nice, but... tell me (as potential reader) what about this blog is (no logo, no introduction... that would help a lot).
I started this blog ..for all readers to hear all the new news in Digital camera subject.Review,photo and latest digital camera.
I think you can make the header's camera smaller(a little shorter than your header) and put it beside your logo