Help me with the LIGHTING

[denikina]

First thing that pops into my mind is, that if you were trying to make it as a kind of a dawn light you should rember, that the sun is at it's lowest and it shines on on the clouds from the bottom, not top as in this picture:



It also gives more colour to the water and is overall much darker than the sun during the day, which would make your drawing also darker, more mysterious and give you the oportunity to highlight some important details, as for example the heads of the beast.

Study some sea landscapes - it should help :)