In María on the Beach at Biarritz or Contre-jour, the viewer sees a woman named María standing on a sunlit beach. The painting is filled with bright colors, particularly the blues of the ocean and the warm tones of the sand. María's figure is illuminated against the light, creating a striking contrast.

The background features gentle waves and a clear sky, typical of Sorolla's marine scenes. This artwork is painted in oil on canvas, a common medium for Joaquín Sorolla. The dimensions are approximately 100 x 150 cm, making it a sizable piece that captures the viewer's attention. The technique used showcases Sorolla's ability to depict light and movement, particularly in the way the sunlight reflects off the water.

The brushwork is loose and fluid, characteristic of the Impressionist style. María on the Beach at Biarritz or Contre-jour was created during a period when Sorolla was exploring the effects of light on water and figures. This painting is significant as it highlights his fascination with capturing the fleeting moments of sunlight. Sorolla often painted his wife and children, and María is a recurring figure in his works.

The painting exemplifies his mastery of color and light, which has earned him recognition as one of the leading Impressionist painters.