The first thing that strikes me about this is the gorgeous colors and lighting. Really nice to look at - so realistic I can almost smell the salt water.
Only distraction for me is the blurry yellow bits at the bottom left corner - I think I'd try to clone them out and leave just the clean shadow of the shell to anchor the bottom of the image.
Simply beautiful, Jose! That lighting is to die for! I agree with Julie on the yellow bits, and I think it could use a bit more room on the bottom and right side. Good job!
A nice & different image !
Also love the light here. Very well exposed image. The warm light no the shell & its reflection against the cool blue towards the top make a nice combination.