Hi Andrew,
I've had a look through them and I think the what you need to pay attention to most of all is improving the composition of your shots. Really study the scene your taking closely and look at what elements within it you need to include and what you can try and exclude.
Your shot of your little girl on her bike watching the swan take off on the lake would have looked ten times better had you not chopped her legs off. You could have also adjusted your position everso slightly so the swan was just off centre on the left and your daughter to the right of centre.
Your best shot is the one of your wife and daughter on the path, but again had you waited until they had taken a few more steps you could have used the overhanging tree on the right to help frame you shot better and shown a little bit more of where the path lead to, to help you tell the story better.
Your shot of the two posts sticking up out of the water in the lake would be improved if you'd got in a bit tighter on them and angled the shot so you didn't see the far bank. The light is also a bit flat and doesn't add anything to it either.
Don't be disheartened though, because we all have to start somewhere and the most important thing is to keep getting out there and taking more shots, but don't just shoot wildly. Think about each shot you take, survey the scene in front of you and try to find something pleasing. Remember to use your feet, crouch down, move left or right to find the best angle and be prepared to wait for the perfect opportunity to appear before you press the shutter.