“If you can include the physical reaction to the emotional situation that your characters find themselves in, you will be bringing your readers closer to the experience of the novel.” 
Walter Mosley This Year You Write Your Novel

Across the field Alan yelled, “Why have you stopped photographing? Do you have what you need?”
“No, my eyelid is twitching. I can’t seem to focus.”
“Well, maybe we should call it quits, this place is pretty intense.”
“But the light is so amazing right now. I will just turn it on auto-focus.” As Miller fiddled with her camera Alan mumbled. “Your amazing light fades to a black whole very quickly in these parts.”
Miller looked up, “What did you say?’
Alan shock his head, “Nothing, just shoot.”