Hey Karen, I am only going to comment on the shot of your daughter, as I don't know ANYTHING about good landscape photos (and barely anything about portraits! ha!). First off, don't be discouraged because this shot has really good elements, including some of the difficult ones.
Here are a few thoughts I had:
--I have heard, as a rule of thumb, to not crop people shots at the elbows or knees. Rules are made to be broken, but I think it applies here. This shot is kind of in "in between" land for people shots, not quite a tight head and shoulders shot, but not a longer full body type shot. I think framing the shot tighter, further above the elbows, would have helped that.
--Agree with above, posing her at a 45 degree angle. Also, she seems to be angled very slightly toward the left side of the picture. When I angle people, I generally like to have them angled toward the center of the shot.
--I agree with the above about a wider aperature and blurring out more of the background. This will make her pop out of the shot more. You can also accomplish that by bringing her out further away from the fence.
--I might bring the exposure for the entire shot up just a little. Also, I think I understand that this was shot with a Speedlight on camera, right? I do think the lighting is a little flat. Either using natural light or going with off camera flash will help that. Sometimes, unfortunately, if all you can do b/c of time or gear restraints is just on camera flash, with no bounce or swivel, you just have to be resigned to the fact that the lighting may look a little flat. This shot is actually a lot better than a lot of straight, on camera flash shots. I don't know what lens you were using, but early on I tried to get lenses (the 50 1.8, now the 50 1.4; the 85 1.8) that would let me shoot wide open to use natural light as much as possible, since for a while I didn't have any off camera flash capability at all.
Don't be discouraged...this is a lot closer to being a really great shot than you think!