Tumblr is amazinnggg.
Yea what everyone said
1. Get a new theme, the theme makers above are good i've used them before. Themes is sometimes what attracts users
2. Postling quite a bit daily. If people see you only post once or twice a day or your last post was a while ago, they wont bother with it because they want updated daily blogs
3. When making posts make sure you tag what's in your post
4. Having extra pages for various things like the top 5 dramas or whatever as suggested above
5. The thing with having more than one blog when you first use tumblr is extremely hard, you have to manage those blogs equally and that takes a lot of time and switching between blogs, you need to get used to one blog first, then have another. But in this case i don't see a reason why MDL needs a second blog..
6. Also change the icon :P
7. Also about the pages make sure you make an INFO page as well as a FAQ page, People will go to it before they check out the site so you should have the basics of what it is. Having a description of it on the side is good, but doesn't provide much information.
8. You can always add music too :))