Oh my! Guidance please and thank you

I am painting the inside of a cave ( black) with a view of the horizon and sea. I stained the canvas with burnt umber as instructed by Mr. Carder and now I don't know if I start painting the sky and sea white and add the highlights of the sky and sea. 
In one of his videos Mr. Carder said to add all the dark values but when I add these dark values that I see in the sky and sea it is not visible on the umber background. 


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