Great posts chaps. Thanks for the support and nice comments.
I'm struggling with the thing a bit. (Have done from the off) I don't really like to see violence modelled, but I'm too far advanced now to scrap the diorama. So I'll persevere. I suppose there is not much difference between modelling death and destruction, as making the things that can cause it.
Anyway, here is the next stage...
I've highlighted the small wave tops in white and added some more general colour, particularly the deep water just after the shallows. Due to the base size constraints I've modelled these as thin bits of water. The real ones can be a football field size and very deep. Imagine trying to run or wade in full kit, in what you think is knee deep water only to disappear under water, down a 6 to 8ft deep bank of sand and fighting to get your gear off whilst getting shot at!
Next, a bit more paint. Then silicone and, if all looks o.k., some varnish.
After that I can start to add the beach obstacles and crank up the action.
Cheers,
Ron