After doing a spate of auditions over the winter, I have been impressed by singers following up when I have asked them to do so. In the past, this was not always the case, and not doing it (when requested to do so), results in missed opportunities more often than not.
So, to reiterate, if you sing an audition, and you have feedback sessions with a judge or adjudicator, and they ask you to follow up with them by e-mail or phone - do so!
If you are asked to do that, it means there is interest. And that is when possible employment gets cultivated!!