On sharing your OCs...
Do it. Just do it.
You aren’t bothering anyone by sharing all the thought and love and work you put into your OC. You aren’t boring them or imposing on them.
What you’re doing is having fun with your space on Tumblr which should be you first priority. You’ve chiseled out a place, built a blog, now use it to host all the creative stuff that you come up with, OCs included.
Never forget that a lot of us in fandom WANT to see your OCs. That’s part of why we’re here and a big piece of what we enjoy about Tumblr. I think most people don’t post nearly enough about their OCs.
So post everything you want to: art, fanfic, screencaps, character outlines, whatever and let the rest of us share what you’ve created.
thejbusition hosts an OC Sharing Day every Wednesday so take full advantage of his generousity and submit some of your stuff to him.