I don't consider myself dark as my skinn is rather pale and my hair some sort of light brownish. The only "dark" feature I have are my brown eyes which sometimes apear dark and sometimes less dark, even greenish.
Anyhow, I know many Slavs who are of darker looks, especially Serbs and Bulgarians. And I don't see the problem in it. Since when are only albinos real Slavs? I certainly don't believe in any kind of Slavic look or apearance. To me, it's BS. I admit, there are some looks that seem to be more often among some groups of Slavs but you can't convince me there is a Slavic fenotype or look or whatever.