I think of this shoot as one of the best shoots I did until now. I like it mostly because of the depth the picture has, even although it has an centered object.
Please note the following and then HAMMER ME!
- Picture is UNcropped all composing was done underwater
- I used my S40 in Canon housing and did not own an external flash at that time
EXIF Data says: F/2.8 and 1/60
Taken at Kas, Turkey
Divesite: Canyon (you have to dive this site when you are there!)
The subject of the picture is superbe and i can see why you like it so much.
But it has some strong Technical flaws.
The "In the flash" part is to saturated and re an the background is distracting to cyan and to bright.
You was probably to far away from the subject and the strobe was not optimal positioned or to weak
I would try a thighter crop, tone down the background and play with the colors and/or the saturation. Probably you have to mask of parts of the Snail because of the different color cast.