Post a picture on your tumblr with the hashtag "betches" in it. A tweet will post to your twitter with the same hashtag.
If
New post tagged
This Trigger fires every time you create any new post on your public Tumblr blog with a tag you specify.
Then
Post a tweet
This Action will post a new tweet to your Twitter account. NOTE: Please adhere to Twitter’s Rules and Terms of Service.
Explore more great ways to automate Twitter and Tumblr (legacy)