Looks great! That seems like a lot of concrete work, most people up here use a rubber liner. Some day I want to upgrade our little plastic pond.
If you have trouble keeping things alive in it check the Ph. The new cement will turn the water very alkaline. This is something I found out the hard way and I killed a bunch of expensive fish just by putting a few cinder blocks in our pond. The concrete needs to age for a while first.
Only offered as friendly advice, I'm not trying to pee in your pond.