A Prayer from Mt. Athos for Consecrating an Iconographer:

Thou Who hast so admirably imprinted Thy features on the cloth sent to King Abgar of Edessa, and hast so wonderfully inspired Luke Thy Evangelist: Enlighten my soul and that of Thy servant; Guide his hand that he may reproduce Thy features, those of the Holy Virgin and of all Thy saints, for the glory and peace of Thy Holy Church. Spare him from temptations and diabolical imaginations in the name of Thy Mother, St. Luke, and all the Saints. Amen.

A Prayer Before Beginning an Icon:

O DIVINE LORD of all that exists, Thou hast illumined the Apostle and Evangelist Luke with Thy Holy Spirit, thereby enabling him to represent Thy most Holy Mother, the One who held Thee in her arms and said: The Grace of Him Who has been born of me is spread through the world!
Enlighten and direct my soul, my heart and my spirit. Guide the hands of Thine unworthy servant so that I may worthily and perfectly portray Thine Icon, that of Thy Mother, and all the Saints, for the glory, joy and adornment of Thy Holy Church.
Forgive my sins and the sins of those who will venerate these icons and who, kneeling devoutly before them, give homage to those they represent.
Protect them from all evil and instruct them with good counsel. This I ask through the intercession of Thy most Holy Mother, the Apostle Luke, and all the Saints. Amen.

A Prayer After Completing an Icon:

Thou, Thyself, O LORD, art the fulfillment and completion of all good things. Fill my soul with joy and gladness, for Thou alone art the Lover of mankind.
Let Thy grace sanctify and dwell within this icon, that it may edify and inspire those who gaze upon it and venerate it; that in glorifying the one depicted, they may be repentant of their sins and strengthened against every attack of the adversary.
Through the prayers of the Theotokos, the holy Apostle and Evangelist Luke, and all the Saints, O Savior, save us! 
Amen.