It depends on the breeding, crowntails are defined by the fact that their tails have those spikes, (doesn't matter the length). Or so I have read, pretty much everywhere.
I can't wait to get a nicer digital camera, the one I have now is a $40 WalMart special... And is decent for pics that are not close up.
If you want more info on Betta's, go to Betta Talk
Took me a lot of researching, before I found it. Pretty much everything, and anything you want to know about Betta's is there.