I consciously noted details of their faces. (Para. 15)
Meaning: I looked carefully on purpose at their faces and paid attention to the personal specific parts of them.
detail: n. a small part or piece
When I read I can never remember the details. 我看書時,總是記不住細節。
We failed the test because many of the questions were about details. 我們考試沒通過,因為許多問題都是關于細節方面的內容。
adv. 有意識地,自覺地