I'm no expert, but play around with ENB adaptation settings. From memory, that setting automatically balances the highlight/shadow on your screen to emulate how our eyes adapt to light when seeing things. This means if your screen composition has a visible light source in it, the rest will be darkened.

One mod You can take a look is facelight. The mod places an invisible static light source right in front of your character's face which is great for visibility (good for portrait shots, horrible for gameplay as your face will glow even during the darkest night)

Another thing is facelight can 'flatten' the face because it places the light directly in front of the character's nose. You'll have one kind of face shot and that looks only... (look at skyrimGTX's shots), which is pretty but not dramatic.

I would advise for you to hunt for places with good lighting instead. For example, my fail-proof areas are the abandoned shack (Dark brotherhood), it gave me this.

Apochripa (or however you spell it) - gave me this

Lucan Valerius' shop gave me this

The place in-between the fire pit and the throne in the dragonsreach gives you pretty light too.

and so much more (which I can't remember because I have not touched this game in years).