Make this kind of gradient (half transparent), and fill the left and the right parts of the image.

We make it to pop the part that is in the center of the image.







Well, it definitely looks popped out.

Now go to the filter gallery that works very fast in this version of Photoshop,



And chose this filter.



Looks ok.



Now I had this feeling that this scene is happening underwater. I will use several layer styles on my pattern layer.



I will color the image in light blue and overlay with most standard Photoshop pattern.



And here we have it light blue.