Andysgirl, you've got some great shots there!
The first shot of the trees. This isn't entirely successful for two reasons. First, your trees in the "centered" shot have a backwards angle to them, see how the second tree is back and to the right? That gives the eye some movement. I want you to be able to either center your shot or give it some angular movement. It's a good picture but the idea here is for you to gain control of using this photographic technique. Either center it or don't. The second shot of the trees is confusing. The trees are in the quadrant but there is a strong angle created by the hill. Remember, the point of this exercise is to use your subject to move the viewers eyes around the picture frame. Your trees are in the quadrant but then for the eyes to move away and back into the frame there is a hill blocking that movement. Does that make sense? I don't know if you can get back to those trees, but I think it would be valuable for you to go there and really walk around and analyze the placement of this subject. Hold your hands up in front of your face and create a rectangle to look through. Ask yourself, how would this shot be different if I put the trees here, or here? What is that hill doing to the overall composition? Is there a cloud or something I can use to create an angle to the background?
This is a fabulous failure! You made all the right mistakes to figure out this lesson! Good job!
Catherine