This is some concept art I made for a director who was pitching his film version of Power Rangers. If you guys remember someone made an amazing PR fan film this year, which lit the fire under many asses to get a full on Hollywood film made. So, many a director jumped at the opportunity. Unfortunately my guy didn't get it, it went to another director. Such is the nature of the film business.
And if you want to be a concept artist, you have to accept that most of what you work on might never be seen and/or made. Many things fail, or get shelved, of indefinitely postponed, usually early on but sometimes even in production. This means you might not be able to show the work you did on that project for a very long time, if ever. But it can really depend on the client, your relationship with them, and how long it has been since you made the actual artwork. It always varies.
So never stop doing your personal work, because sometimes, THAT is the work that will get you hired on a project like this