this one underwent a few changes :>) - I decided to have the tide in, rather than having a beach with pools - the waves made for a better composition and I like the perspective of being in the air, hovering somewhere over the waves. I also sorted that sky that I hated.
You can see the very early stages here http://vivienb.blogspot.com/2008/01/work-in-progress-seascapes-stage-3.html (it's the third image down in this post) and at a later ugly underpainting stage here http://vivienb.blogspot.com/2008/01/seascapes-update-work-in-progress-16th.html when I was planning to keep the foreground as sand and pools.
Lots of that underpainting still shines through in the final version.
I wasn't at all happy about it until I sorted the sky out and made that decision about the high tide, then it came together, at last.
Do you work in series? Do you like to look at the same scene or small area in different lights and seasons?
Monet did and so does this artist http://web.mac.com/suncage/iWeb/Site/Suncage.html who made a contract with himself to paint outside daily and produced some stunning work, often revisiting the same place in different lights and different times of year. His site is well worth a visit.