OK first get yourself the (free) RAW converter here... does a really nice job. Notice you can adjust the white balance AFTER shooting...
http://www.pixmantec.com/index2.html
Now- Your parameters look pretty good. A couple notes though-
You shot at F/5.6, that's the "AV aperture value" in the EXIF data you posted. That's your F-stop setting also known as your aperture. The higher that number is, the more depth of field you get (keeping it simple here...).
Imagine a line going from the lens through your subject.
Depth of field is the area going toward/away from the camera (on your imaginary plane) that is in focus. Perfecr example would be pic #2 of the clam that you just posted. Notice the back of the clam is out of focus? Had you shot at f/11, it probably would have been in focus, because you would have had more depth of field.
Another note on your EXIF data- you want to keep your AF mode in "One shot" when shooting non/moving objects. AI focus is for fishies. We'll cover that later.
Your composition looks great, and if you're just getting lucky, well, throw some of that luck my way. LOVE the last fish pic!