Here are all the Equestria Girls villains tags.

Sunset Shimmer is always the first because everyone likes her.

The Dazzlings have a lot of images too. But Sonata is the highest because she is the cutest.

The Shadowbolts have some interest.

Wallflower will be the centre of the interest soon. She has more images than Gloriosa and Juniper! Although she appeared after them.

Everyone hates principal Cinch so I'm not surprised why she has less images.

I don't understand how Vignette and Postcrush didn't become popular. I thought they will have more images than principal Cinch but I was wrong.