How to block skylight in indoor environment?

[Haoris]

… you make 0 sense. My art direction is why my outside is dark. You could flip the variables around and achieve the same end result.

Then how does it looks like with overcast/foggy lighting conditions and a bright skylight because there’s a lot light reflected by the sky/atmosphere? Your cave entrance viewed from outside looks not dark at all, right?
Also your interior shadows get the tint of your sky. They will be blue when the sky is blue, orange at sunset, etc. The skylight is not occluded, it’s just a bit less intense

• and as far as the light of the interior being flat *
  there are no light sources in the interior and the value is overly exaggerated to demonstrate. On top of a **** texture that’s got very light normals.
  If you add a torch the interior would obviously look much better and probably not even need the component at all.

What I mean it that there’s no light occlusion from geometry. The roof is as bright as the ground.
Look at how shadows are not uniform in 's IBL work :
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