The three panels represent, from left to right, the donor (possibly Jan Ymbrechts of Malines) in a garden kneeling in prayer, the Annunciation to Mary set in a contemporary domestic setting, with the the Archangel Gabriel appearing to The Virgin.
The three panels represent to right. This is from left. The donor (possibly Jan Ymbrechts of Malines) in a garden is right. The Annunciation to Mary is a garden. This Mary is set in a contemporary domestic setting. This was with the the Archangel Gabriel. This the Archangel Gabriel is appearing to The Virgin. This garden was kneeling in prayer.