Started by placing dog, hunter and source image roughly where I wanted them, after cropping out hunter from his background
step 2 of 7
placed water behind both images and used faded eraser around dog
step 3 of 7
used smudge tool to smooth out the closer waves of the water picture
step 4 of 7
cropped around grass to show water through
step 5 of 7
used clone tool and a scattered/jittered eraser brush to extend the algae
step 6 of 7
Darkened image using curves and levels
step 7 of 7
rendered several layers of clouds, set them to "lighten" and moved them around, also adjusted opacity on each layer. Then used a large soft eraser brush to remove any harsh angles on clouds layers