I think your pictures turned out quite nice. They light one has a nice airy contrast to in and it looks very calming and peaceful. I like the darker piece as well especially no the leaf area. You still managed to differentiate between leaf. The only thing I feel had slight problems was the moon. It looks a little smudged in the dark area and it doesn’t blend perfectly. However I still feel that both your pieces were a success. They both look very graceful.
For this exercise, I chose to try a painting of a flower with the moon overhead. I thought it was a good way to see the difference in light and dark values. The light dominant picture has more of a watercolor feel to it and could almost pass for daytime. The dark dominant picture is clearly at night and the colors are darker and richer. I don’t think I have a preference between the two styles, I could see how either one could work nicely for different projects. 
I think your pictures turned out quite nice. They light one has a nice airy contrast to in and it looks very calming and peaceful. I like the darker piece as well especially no the leaf area. You still managed to differentiate between leaf. The only thing I feel had slight problems was the moon. It looks a little smudged in the dark area and it doesn’t blend perfectly. However I still feel that both your pieces were a success. They both look very graceful.