The Automatic retweet? Useless. I have a page where I tweet only my works. No retweets except rare cases.
Usually i RT tweets of important profiles (museums, art galleries, etc.) and only sometimes something of my followers. This is because I am that I must be retweeted, I create contents, and those need to be shared, not more.
Here my profile as an example. https://twitter.com/Erian_A
The problem is to try to create interesting tweets