Painting by high school girl? This is my only oil-painted card that has a message and postmark (1910 from Nagasaki). It was addressed to a lady in Alameda, California and says in English that the card was hand painted by a Japanese high school girl.

Whether this is true or not, I don't know. But the painting style of this card and the others you see here are the same. (I bought them as a set.)