Looks great. It is weird how everyone has problems with their res escaping. I have had my res in for almost 2 years now(2 hibernations) and they have no intentions on leaving the pond. I have never seen them go farther than the rocks on the side.
Also looks like you have some extra liner, get some more long thin pieces of stone and you can folt the liner over them so you can raise the water to the rock and hide some of the liner if you like.
