A richly robed angel kneels in the foreground, occupying the lower half of the panel, with a crown on its head and iridescent wings that shift from green to pink. The angel's right hand is raised in a gesture of speech or blessing, while the left hand delicately holds a stem of white lilies, their petals rendered with crisp precision. The angel's cloak, painted in creamy whites with gold trim, cascades in deep, naturalistic folds that pool on the tiled floor, each shadow and highlight carefully modeled.

A large medallion with a blue stone fastens the angel's garment at the chest, catching the light and reflecting the artist's attention to the play of surfaces. Behind the angel, a vaulted architectural setting recedes in perspective, with a distant view through an arched window revealing a small building and blue sky. The ceiling beams above the angel are painted in warm browns and create a sense of depth, while the stone framework of the panel is meticulously depicted, complete with subtle textures and simulated wear. Above, in the semicircular upper section, the prophet Zacharias appears at a desk, his bearded face intent as he reads from a large open book and gestures toward a scroll unfurled before him.

Zacharias wears a fur-trimmed hat and a mantle lined with ermine, and his figure is framed by a painted stone arch that echoes the architecture below. A banderole with black-letter script curves around Zacharias, adding a sense of movement and connecting the prophet visually to the angel below. The overall palette is dominated by soft creams, golds, and earth tones, with the angel's wings and the blue stone providing subtle bursts of color.

The paint surface is smooth, with fine brushwork visible in the angel’s hair, the feathers of the wings, and the texture of the fabrics, demonstrating careful attention to detail. The composition is vertically divided, with the prophet occupying the upper lunette and the angel the main panel, their gazes and gestures forming a subtle diagonal connection.