Can you help The Postcard Detective

Young Girls at a Party?, Hemel Hempstead, circa 1900

Or possibly a school group?

Can you identify these children

Mrs Julianna Dunn, of Alexandra Road, Hemel Hempstead (next door to the house where my mother lived as a child) took the first photograph. She was at the address between about 1886 and about 1916, but the pictures were probably from the earlier part of this period.