Yog Sothoth progress

I started to paint Yog with a plain pallet of green murky hues opposed to greyscale

I was having difficulty with light sourcing as i had no reference.
I asked a friend of mine who's artistically accurate to push me along the right lines with lighting and if im doing anything wrong.

Here i added an overlay of gradated black shadow to really bring out the depth of the peice, wanting to work that in some how, make it more dramatic with the shadows.

She came back with a  this image ((not this exact one as it was using green base tones and i saved over it without thinking when i was fiddling around with the colours)), reminding me about bounced light and other atmospheric light.
with her help i overlaid some dark shadows and changed the base colours from green to a fleshy tone which worked beautifully with the red bounced light and blue atmospheric as you can see now.

IM going to be using this as a base to work on,  refining the stomach to be more portcullis then boiler
that and adding in the gaseous boils, working off this other artists rendition of Yog Sothoth

for now he is unfinished and awaiting development