Well, that's encouraging. Thanks guys. So I'll continue working on this. Do nitpick!! Better version is rendering right now, without water, but low tide version (lot faster).
Lines are by contour shader. I don't really like the contour shader, but it kind of works here.
Yes, the foam lines are remains from windblown high waves at the ocean, but maybe too much, too large. Maybe I'll try to isolate the wave tops and stretch foam from there (somehow...).