In Portrait of a young girl at the well, we see a young girl dressed in a simple yet elegant dress, standing beside a well. The colors are soft and warm, with a gentle play of light that highlights her features. The background features lush greenery, suggesting a serene outdoor setting.

The overall composition conveys a sense of innocence and tranquility. The painting is executed in oil on canvas, a medium that allows for rich color depth and texture. The brushwork is delicate, capturing the softness of the girl's skin and the flowing fabric of her dress. The artist uses light effectively to create a three-dimensional effect, drawing the viewer's eye to the girl.

The dimensions are approximately 60 x 80 cm, making it a moderately sized work. Narcisse-Virgile Diaz de La Peña was a prominent figure in the Romantic movement, known for his landscapes and portraits. This particular work reflects his ability to blend realism with romantic ideals. An interesting fact about this painting is that it showcases the artist's fascination with the theme of childhood and innocence, which is prevalent in many of his works.