Here you go Alan. This nest actually over looks Omaha Beach. Good for your cliff colour request....
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Just down the beach from Omaha......Point du Hoc, where the American Rangers scaled the cliff.
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This is the famous bunker seen in The Longest Day. Also, you will probably have seen the post D.Day photo of American soldiers marching up the path besides it, with the beach littered with all sorts of invasion gear. It might help you with your bunker.....
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Same bunker looking out over Omaha.....
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I hope these will be of some use to you during the making of your excellent diorama.
Ron