If, as Pablo Picasso said, 鈥淧ainting is just another way of keeping a diary,鈥� then the upcoming exhibit at the 91吃瓜网 Art Gallery reflects the turbulent and optimistic pages from the lives of some young artists 鈥� children who are homeless, living in foster care or in other disadvantaged situations. 鈥淗earts from the Arts,鈥� the gallery鈥檚 first outreach exhibit of…