One of several frescoes in rooms 9, 10 and 12.

A viewer suggested The mother of God from annunciation, which I take to be: Maria.

In Byzantine iconography, the blue robe and the red veil are the typical dress of the Holy Virgin (Mary) – blue being the symbol of both the terrestrial and celestial, and red the symbol of eternal life and, at the same time, the color of blood and torments.
She has risen her right hand in surprise; this attitude identifies the scene as being an ‘Annunciation’.
Byzantine fresco from the 12th century.

The icon of the ‘Annuciation’ refers to the Gospel (Luke 1:26-39): the announcement by the angel Gabriel to the Virgin Mary that she would conceive and become the mother of Jesus, the Son of God.

Correspondent: J.M.Criel, Antwerpen.
Source: Websites of ‘stnicholascenter.org’ & ‘orthodoxworld.ru’ .