OTMAA WIP - Marie and Tatiana

I'm a big Russian History buff - I've read all the books. I got interested when I discovered that my Great Aunt Charlotte was an English governess to a Russian noble family around the turn of the twentienth century and was acquainted with the children of Tsar Nicholas II, the subjects of this painting.
I've been working on this one for a couple of days - it's the right half of a painting that will include all five of the children. This is Marie and Tatiana. This section of the painting is only about 8" by 10", so the details are pretty small - I'm really giving my fineliner a workout.

The children are now saints in the Russian Orthodox Church.