Solider. Mother. Father. Son. Lover. Husband. Friend. Daughter. Sister. Brother. Stranger. Clergyman. Aquantance. Who is the letter from?
Is she reading a letter sent to her, or spying words sent to another?
In her solitude, as she reads, does she hear the person’s voice in her head? Is she formulating a response, or is she receptive?
She is by a window for light. Is the letter light and air to her?
The paper on which the letter is written is clean and uncrinkled. This is not an old letter, something she’s read before, but something new.
She holds the letter at heart level and appears very still. What will she do next?
Prometheus Unbound 
That is a very beautiful painting. I wish it was mine.