My first pond was also very small, created from a pair of pre-formed liners that were given to me by a co-worker. You make do with what you have, and I learned a LOT over the years with that pond. With that small of size, the pond can quickly overflow or drain dry, so you really have to keep an eye on things. Pump lines are smaller and freeze easier, but in your area that certainly won't be a problem.
Here's what my first pond looked like shortly after I set it up. The upper pond is 160 gallons and the lower is 75 gallons. One of the biggest problems I had over the next few years was that the 'ears' on the lower pond wanted to compact into the soil, and ended up at least an inch lower than the rest of the liner. I also had similar problems with the upper liner, but because of the built-in waterfall, I had no way to regulate the water level in that part, and it became a source of much lost water.
One thing I strongly advocate is LOTS of plants around a pond. Not only do they make it look more natural, but they also help clean the water and can provide another source of food for the fish. Of course, when you have a small pond, things can get overgrown before you know it!
Your pond looks great so far. Can't wait to see the daytime photos!
