the composition needs some work. when composing an image i tend to worry less about the rule of thirds and more about what my image is about. what is the focal point in this image? can i see it clearly? are there any clues that make it the focal point (size, leading lines, tones, color which isn’t applicable here, etc..)?
there is a potential leading line here in the small stream on the right side, but it just leads back to nothing. if the pool is dead center behind the grass then i would tried to make that stream my foreground and pushed the line that way, if that failed i’d look at some of the cracks in the rocks and see if any of them point to the pool. i’d also try to get the pool in better light, or make it bigger in the frame.