In a niche shaped as a Greek temple a woman with a crenellated crown - allegorical figure for the town of Riga - is flanked by two school children. On the school's website the sculpture is described as a mother holding a boy and a girl.
Annotation
The school is built 1883 after design of the architect Reinhold Schmeling.
Sculptor
August Volz - Latvian Augusts Folcs (Magdeburg 1851 - Riga 1926),
German-Latvian sculptor from Riga
(Wikipedia).