Ulzzang (pronounced uhl-jang) translates to "best face" or "good looking" in Korean. This slang is often used by netizens, contests including girls competing for the title of "ulzzang". However, even if this is true, Ulzzang has developed into a subculture/style, rather than a competition/contest event.
They're usually Korean girls (sometimes Chinese or Japanese; some even being in North America), who all share similar features. Eyes being the main focus and concept of the look. They usually use lots of products to make their eyes very large, such as eyelid glue, Korean cosmetic circle lenses, eyeliner, long fake eyelashes, etc. They also usually have fair skin, a small nose and thin small lips, just like anime characters. They use a lot of editing websites such as Photoshop and Haduri to edit their pictures to make them even more prettier. Some Ulzzang's have even gotten famous, such as Goo hye sun, Nam Sang-mi, Park Han-byul, Kang Eun-bi and Kim Hye Sung.
Umm ... are so beautiful that seem Martians or angelic divinty...(¬‿¬)...WOW.