I would pose a question to those familiar with the history of iconography. In the art of the Christian west, the Annunciation is commonly portrayed in a very particular manner. The angel Gabriel is most often shown bowing before the virgin, whilst presenting her with a white lily (either in hand or in a vase). This is a fair example :
Is this symbolism prevalent in the oldest of icons? Some icons I have seen have lilies while others do not (and I am curious as to when this type of depiction became common).