How to realize ps seawater color matching

First, select a character and copy it as the second layer.

Then choose the layer 1? Choice? Image adjustment? Optional colors? Transition color

Adjust various color values? See if you like adjustment?

Then use polygonal lasso to select the upper right corner of seawater and build the third layer?

Choice? Image adjustment? Optional colors? Transition color

Adjust various color values to deepen blue?

Finally, use the rubber tool to set the opacity and flow rate to 50% respectively. Excessive friction

Save the picture, huh?