It seems that Natalya, Peter the Great's sister, was a bit more modern than her half sisters. I think she dressed in a Western way, and acted less Muscovite if I remember correctly. She never married a foreign Prince, but she had a better than average life in Russia. I don't think she was so much of those Terem Princesses. I have seen a portrait of her, and she greatly resembles her mother, and brother, but she was rather plump, and not that pretty.