Usability issue: name actions consistently when choosing an audience.
The action bar action is "Choose audience" but the corresponding dialog action is "Pick". There is no obvious reason why they couldn't be the same.
In the dialog you choose a ready-made audience segment or create an ad hoc audience using individual traits. This work is effectively known as "choosing an audience". Once you are done with the work the logical thing to do is save. I recommend changing the "Pick" label to "Save".
Furthermore, using "Pick" in the dialog suggests that there is still more picking to do. But the action concludes the work.