Tumblr started out as my worst in terms of feedback (and my webcomic's blog has been a LOT slower to gain followers than my main blog) but I now think I get more response from my main tumblr's followers than I do on twitter!
My experience with tumblr is that - unlike twitter - it tends to be disappointing if you're using it promotionally. We're encouraged to be professional in every other medium, but on tumblr that falls flat -- it's not really built for easy feedback or for creators; it's more built for casual blogging. If you're able to be more personable, post about other things you care about, or if you participate in a community of some kind, you're more likely to find a niche there -- everyone talks about how you need to draw fanart to survive on tumblr, AND IT DEFINITELY HELPS, but I think fanart is just the easiest way to connect with an existing community there.
Fanart from me is pretty rare and never has a lot of time spent on it -- I tend to just scribble an idea I had and then move on to draw my own stuff -- but I only scribble fanart of things I love, and I think that's actually the part that matters.
In real life, if you barge into a room of people and just start trying to sell your stuff, most people in the room won't be interested in you. Tumblr is sort of like that. Interest is slow unless you engage them in something they care about and they find that you have interests in common!
Fanart will always get a bigger response, though, even once you have an audience. Here is a trick my friend Steph gave me for surviving on tumblr and not getting discouraged:
- if you post fanart on tumblr, and it gets 50 notes, you got 50 notes! Cool!
- if you post your own original stuff on tumblr, and it's something your followers are familiar with (like, your webcomic characters or something you talk about a lot), and it gets 50 notes, add an imaginary 0. That's the equivalent of getting 500 notes with fanart. Good job!!
- if you post your own original stuff on tumblr and it's characters people don't know yet, and it gets only 5 notes, add TWO imaginary 0s. it's the equivalent of getting 500 notes on a piece of fanart. BE PROUD OF THOSE NOTES!