Wassa...to the best of my knowledge...there is no such rule on this site. If the photo is useful and helpful and something you want to share with the rest of us, especially in the viewfinder forum, which is our "living room", please feel free to share it. If it is a shot that you think you'd like to try to make better in Photoshop or some other post processing program...we'd be glad to offer suggestions. I'm sure PJ will say the same thing, at least I hope. I've seen many shots from many years ago.
I'm just an advanced novice myself, struggling to be an amateur...hehehe...but this site is very accepting of everything we do...within reason...so please post away...i'm sure your experience will help us all!!!!!