step 4 of 8
I took the source image, copied part of the water to enlarge the scenario.
step 5 of 8
After I added, one by one, the outsource images, using masking layers.
step 6 of 8
Added shadows for the children.
step 7 of 8
I created a new layer for texture, changing hue, saturation and lighting to get soft colors.
step 8 of 8
I did the process twice more, for boat and sea.