DO include a one-sheet or short band bio. A picture is great too, but not entirely necessary.
Why? You’ve sent out your CD, it’s in your target person’s hands which is a great first step, but make it a little easier on them to find out more about you. On your one-sheet, promoters, agents, music directors, etc. can find out WHO you are, information about your album and music, and where to find out more information, without having to go hunting through the internet searches.