Need more info on getting tumblr followers? Thanks!!?

[Manny]

This is kinda a re-post.. I just wanted a little bit more information the first time I asked the question. So, basically I just started using my tumblr that I have had for like a year lol ( I started posting stuff like a couple of days ago). I post pictures and gifs about The Vampire Diaries. I don't have many followers "20" to be exact so, I was wondering how one would go about getting more followers.. Today, I got less "likes" and followers than I did yesterday. So I wanted to know what people do to get followers? Do they just continue to post and that's how they get popular? Thanks so much!
http://serenedipitty.tumblr.com