i think it looks nice but you can still make it look even better with a header or logo image also, don't place two adsense blocks close to one another
If your top right menu has no content, why not just use 2 columns format? And also, few images are broken, to check them, please use Google Chrome.
According to me your site is very informative and I really like the content of the site you should add more images and video to your site