This song is on Vulgar Display Of Power, one of the best hard-rock records ever made. The sound is very...empty. Empty of any accessories, stripped-down, primal. Anselmo is reproaching somebody, and is almost annoyed enough to kick their ass. Dimebag Darrell(R.I.P.) does his usual excellent-but-not-showy guitar solo. All the guitar mags were calling this style "Power Groove" when it came out.
I notice a few of her songs are on here, appropriately, because she is an amazing singer/songwriter/musician. Her lyrics are quirky and edgy, but also catchy. "Not a Pretty Girl" is basically saying 'hey, i don't need to be rescued, so get lost little boy".