Hi Coachbaglady,
The problem with your latest template (Looks great, by the way), is it does not have the [DESCRIPTION] tag at all. What the message means is you must have at least one [DESCRIPTION] tag but no more than one. I hope to have the error message that people recieve reflect our intended message more clearly!
And the answer to your question regarding images expiring within a certain time, the answer is no there is no expiration time.