I'm not a professional photographer by any means, but here are my thoughts on the shots.
The first image doesn't really work centered. It might offer more interest at another angle with less space being taken up by the large boulders. Secondly is the exposure, contrast and saturation. The trees should be deeper in color, the sky is bland and distracting in white, and the rocks are too brightly lit. The location is definitely promising with some tweaks.
The second image is along the lines of a commonly used theme. I think a more colorful leaf, such as red or yellow, shot from overhead with a good polarized filter would enhance the photo (or at a greater angle to show the curves of the leaf floating over the water). Being able to obtain some detail under the water with less surface glare decreases the mixed light and dark visual clutter, and shooting overhead would keep the main subject in full focus without having to close the aperture too much. Also, centering the focal interest is not always agreeable by many art and photo enthusiasts.
I think you're off to a good start and some practice will get you where you want to be. Don't be afraid to spend a couple hours in one location shooting from every possible angle while adjusting manual settings per angle. Take your time with each shot setup, take notes, and be aware of where your light source is coming from. This will give you plenty of options to look through and determine what is most visually appealing.
Keep shooting and have fun!