How to maintain a successful blog?

[yuyoyuppe]

I've started a blog on tumblr not so long ago that's for sharing drawing ideas, practice tips, and creativity-boosting activities. it's rapidly gained a total of 139 followers, which isn't much really, but it's happened in only a few short months. It certainly has the potential to become at least a little popular doesn't it?? Well, that being said, I have try harder to maintain it if I want it to happen. And I have just a few questions on how.... So.

1.How many times per day should I post?
2.What time(s) of the day is best for posting?
3.What else can I do to maintain a successful blog?

Thank you in advance for your answers c: and sorry for the somewhat unnecessary anecdote xD

Oh, and you can check out my blog here, btw: http://miss-sweetsosweets-inspirations.tumblr.com/