Sus hijos a caballo - equestrian portraits of his children, by Joaquín Sorolla y Bastida

Elena y María, con trajes valencianos antiguos, 1908. The artist's two daughters.

Grupa Valenciana - the artist's children, Joaquín and María, dressed in traditional Valencian costume, 1906.

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Painter Julio Vila y Prades was an assistant in Sorolla's workshop from 1893 to 1904. I don't know whether he painted this cropped version of the same 1908 composition of Sorollo's children at the same time as his fellow artist or as a later copy. 

Elena y María, hijas de Joaquín Sorolla con trajes valencianos, by Julio Vila y Prades, circa 1908.

Julio Vila y Prades (9 April 1873, Valencia - 9 July 1930, Barcelona), Spanish painter and muralist who also worked throughout Latin America.