step 1 of 5
load the pool as background and the sink. change the hue/saturation of both and match them.

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step 2 of 5
add the water and change the perspective a little. use eraser to delete the side and make it look inside the sink. change the hue/saturation a little.

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step 3 of 5
add the dog and the girl. change the hue/saturation of each. clone the shadow away from the dog.

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step 4 of 5
add shadow around the pool side, a little under the water around the pool side, under the dog and under the girl and set them to 'soft light' and reduce opacity.
step 5 of 5
add a soft blue and a little brown reflection on the faucet and set it to 'soft light' then reduce opacity.
for the water from faucet, use a splatter brush w/ white color then slowly click (not drag) down toward the girl...for a little blur effect use the same brush on the 'smudge' tool w/ 5 strength and brush it in a circular motion.