Like the Abyss? Something like this? Dead easy. In the materials section, set the figure to almost transparent (I used 80%) and the colours to: Object color - white Highlight color - white Ambient color - blue/green (I used 151 240 222) Reflective color - white Set highlight size to 10% Make all the inner mouth parts and nostrils black on everything and set transparency to 100% for these parts. You could improve it by making a seawater texture and a variable transparency map, but that's the basis.

Coppula eam se non posit acceptera jocularum.

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