Reflections of trees between stones in a puddle

This is one of the first photos I took at Hardcastle Crags with my DSLR in June 2013. I'd intended photographing a little waterfall, but when I got there found that it had dried up due to a recent lack of rain. All that was left was this little puddle, so I set up my tripod above it and experimented. Close-up compositions had quite an abstract effect, made even more so by focusing on the reflections rather than the stones.

Camera/lens settings: ISO 100, f/9, 1.3s, 55mm, tripod.