First of all, thanks for doing this class I really enjoyed it.
The first one is of a sunflower (not yet bloomed) I placed it on the lower right third. I also lightened the tips of the flower to draw the eye to them.
The Second is of the Pennybacker bridge in Austin TX. I used the lines of the cars coming and going to lead to the sunset.
The third one is one of my most recent shots. It's a 9 shot pano. I placed the mountain and horizon dead center for symmetry.