If you're searching for pictures of Bulgaria that are suitable for use in Wikipedia, here are some resources:

• Nikola Gruev's personal website → The site has abundant galleries of about 70 places and objects in Bulgaria. All images are GFDL-licensed and use is kindly permitted by the author. Tags to use: ((NGruev)) + ((GFDL))

• ImagesFromBulgaria.com → A free resource for images of Bulgaria, offers a large collection of thematic galleries and high-quality images. Tags to use: ((cc-by-2.5))

• Klearchos Kapoutsis' blog → The author is kindly publishing the vast majority of his photos and all of his posts under a suitable Creative Commons license, namely Attribution 3.0 Unported. His photos are usually hosted on Flickr, but the blog is a good access point because it offers more information about the events or places pictured. Tags to use: ((cc-by-3.0))

• World66 Bulgaria travel guide → Most Bulgaria-related travel guides have pictures. Pictures are not high-resolution, but all works are Creative Commons Attribution-ShareAlike 1.0. Tags to use: ((cc-by-sa-1.0))

• Some Flickr images → Images at Flickr are most often non-free, but a number of pictures, including such of Bulgaria, are licensed in a suitable version of Creative Commons. For information what CC licenses are accepted in Wikipedia and what are not, see Wikipedia:Image copyright tags. If you'd like to look only for free images, use the Advanced Photo Search with all three fields in the Creative Commons section marked. This way, you'll only search for images suitable for use in Wikipedia. Tags to use: see individual image license

Feel free to add resources you've discovered to this page.