I think it looks great! Some notes:
• The forms on Contact Us and About Us are very narrow, and the fields have quite a lot of padding in them -- both things just look kind of weird.
• Red and green text on About Us looks awfully Christmassey.
• Problems on
http://www.seo-service-provider.org/clients-saying/: each review div is huge and also empty (except for the bit at the top with the customer's gravatar, name, and website link).
• Consider asking an English-speaker to edit the copy throughout your website.
• The copyright statement at the bottom of the page could use some padding around it.
• Use breadcrumbs on every page. E.g. there's none here:
http://www.seo-service-provider.org/portfolio/seo/.
• When you navigate to the blog, the top-navigation changes. That's confusing. Consider leaving the top-navigation the same, and providing a sub-nav bar for the internal blog navigation.
• Is the Bangla Blog the same as the SEO Blog, just they're in different languages? Consider a single menu item in the top-nav: "Blog" -- and then, on that page, put a prominent link at the top to switch the language.
• It would be better for your branding and the user experience generally if your Directory had the same style and appearance as the rest of your website.
Best of luck to you!