As an exercise in composition, I'd recommend using a tripod on some of your field trips; spend time on composition, observing how little changes in perspective can change a whole picture. This will be very helpful even when working without a tripod.

Also carefully watch the light, and how it can hide or emphasize depth and composition. I think a few splashes of light/dark would add to a composition like yours above.

Try to do 100% with your camera; pictures you 'find' on your computer are often just halfXX ;)