This reminds me of a character from one of my books, a young Norwegian woman named Saeradaria. It looks just like her...but the title also reminds me of her, as Saeradaria has been living for over 200 years at this point. (she has a special magical gift that keeps her from aging). I think of the letters as representing her memories of people deep in her past. The fact that she's sitting isolated is also symbolic to me, as Saeradaria feels isolated from everyone in her world, since they do not understand her, and she will probably outlive them.
This is a beautiful picture, even without the special meaning it holds for me.