Help me improve this image

Hi,

This is a pic of one of the wrecks of the Daedalus reef in the Red Sea. I'd love to get some pointers on how to improve it. One of the problem I have is that I introduced noise in the water when I used the channel mixer to add back some reds.

The picture was taken with the Sony RX100ii in a Nauticam housing.

My best effort:

Original JPG straight from the camera:

And a link to the RAW file here: http://jdelage.public.s3.amazonaws.com/Sharing/DSC00324.dng

Thank you,

Joss

since you have the raw, I would say avoid the channel mixer. Multiple ways to skin the cat. I did this quickly in Lightroom 5

Exposure +1.29

Temp: 20787

Tint: +150

Highlights -100,

Shadows +100,

Whites +24

Blacks -60

Clarity +17

Saturation - to taste - strong agrument to leave it a little "blue" given that is what we see underwater and what the viewer might expect it to look like.

Reds: +81

Greens: -73

Aqua: -39

Blues: -9

noise reduction

Luminance: +50

Color: +25

Sharpening +50

Masking: 90

and the spot healing brush on the diver and fish (Photoshop would have done a better job)

raw

https://dl.dropboxusercontent.com/u/78937/wetpixel/DSC00324.dng