The Angel cried to the Lady full of grace:
Rejoice, Rejoice O Pure Virgin!
Again I say: Rejoice!
Your Son is risen from His three days in the tomb!
With Himself He has raised all the dead!
Rejoice, Rejoice all ye people!
Shine! Shine! Shine O New Jerusalem!
The glory of the Lord has shone on you!
Dance now and be glad, O Zion!
Be radiant, O Pure Theotokos,
in the Resurrection of Your Son!
There are nine exclamation points in the hymn above, indications of surprise and delight. And while there is no biblical account of Mary receiving her own personal visitation of an Easter Angel, here, out of love, the Church has created this most happy and tender scene.
But the hymn is about the New Jerusalem too, of which Mary is a type or image in faith. That New Jerusalem (Zion) is the Church, the family of Christ born in Baptism. The angel even directs us to dancing in the joy of Christ's trampling on death. And of course, Theotokos is the Greek word for Mother of God.
As the luminous icon doesn't seem to have any name, we might call her something like, Mother of God, Rejoicing or Mother of God ~ Easter Brightness.