Who is your target audience for the site? Is this a site that you point people to who want to view your portfolio? Or, is this meant to act as a marketing site to help new people find you? If the purpose is the first, then I think your site works well. However, if you are wanting to get new clients through this site, you should consider adding additional elements that will help search engines find you.
Here are a few thoughts:
* Search engines utilize text to index your website. The only page in your site that has much text is your bio page. Thus, this is the page that will likely show up the most in the search engines. However, this page is exclusively text and does not show any of your photographs. To adjust this, add more text (descriptions of images, information about your studio, etc) to the pages with-out text, and add a relevant image or two to your bio page.
* The name of your company is only listed in the header, and this is done as an image. It is fine to do this (it does ensure that the font chosen will appear the same to all users), but you should have the name of your company listed elsewhere as text. Again, search engines know how to parse text, but they cannot (yet) read images to determine what the text in them says. Consider adding the name of your company and your city at the footer of all pages. Note that if you search Google for "sofia bulgaria photography" your site does not come up, but this likely what some of your potential clients might look for.
* If you are really interested in improving your site's performance in the search engines, do some research on SEO (search engine optimization). It's a field unto itself, and it is probably more work that you want to get into, but you may find it interesting to at least be familiar with the basics.
Your site is very clean and works well as a portfolio. You have some great photography showcased there.
Wow, thanks for the great advices, Enigmacypher. I actually use it just for a portfolio showcase as you assumed. I don't have any ambitious to use it as a marketing tool for now, but I will take in consideration all your advices :) Thank you!