Original image
step 1 of 9
sources used for this step:step 2 of 9
step 3 of 9
step 4 of 9
step 6 of 9
step 7 of 9
Added fish and match color with the backround.
step 8 of 9
Added shadows and different bubbles. Lowered opacities for convinience.
step 9 of 9
Added some adjustment layers: brightness and contrast, added some light blue soft brush for light, added black gradient for shadows, gaussian blur, and selective colors to calm down the tones.
Final result
