Describe the little girls and boys in the portraits in The Secret Garden.

From the text:

Some were pictures of children—little girls in thick satin frocks which reached to their feet and stood out about them, and boys with puffed sleeves and lace collars and long hair, or with big ruffs around their necks. She always stopped to look at the children, and wonder what their names were, and where they had gone, and why they wore such odd clothes.