And liberal Catholics in my country ask why Christians in my country are persecuted and our churches attacked. Well if we are going to allow desecration of our holy altars and churches in my country and worldwide, if we destroyed our own altars and sanctuaries post Vatican II, if we ourselves encourage religious indifferentism and syncretism, why should we be surprised when Catholic churches are attacked by mobs and idols installed and statues vandalised. For the punishment of the sin takes the form of the sin. See Wisdom 11:17 (DRB)

Wisdom11: 16 But for the foolish devices of their iniquity, because some being deceived worshipped dumb serpents and worthless beasts, thou didst send upon them a multitude of dumb beasts for vengeance. 17 That they might know that by what things a man sinneth, by the same also he is tormented.

The only person who can give the Body of Christ is Christ Himself, this is part of the mystical marriage. Christ gives us His Body through the hands of a priest who is another Christ. I am not Alter Christus so I cannot take with my hands and give myself the Body of Christ. Nor can any 'extraordinary' minister. Therefore it's on the tongue only, from a priest only.

I saw Bishop Athanasius Schneider clarify this in an interview - At the last Supper, it is not clear from Scripture whether the Apostles received on their hands or on their tongue. But even had they received on their hands, they were already Bishops.

Anyway there are also more imp reasons as given by others in their comments here.

To this I will add:

The practice of receiving in the hand is inherently open to sacrileges, not just in leftover particles or particles flying. I have seen in my Novus Ordo parish people just taking it like a wafer between their thumb and forefinger, people walking off with it to consume in the pew, even a consecrated host thrown in the holy water font. A priest in my diocese had spoken up against Communion in the hand, quoting the rates quoted by sellers of Consecrated Hosts in the city.

This old news article should have woken people up but sadly, nobody cares.
Stealing Hosts for anti-Catholic art? Not illegal, Spanish judge says.

It's strange. When one looks at the face, it looks distorted and too angular, whereas one would expect a softness and youthful look to the young Virgin, the most beautiful woman in the world for all ages.

Secondly, the hands of Our Lady at the Incarnation is unlikely to be this open, arms outstretched away from body. Our Lady may have been praying with hands folded, or Her hands would have been closer to Her body.

Lastly, one cannot see Her foot. Traditionally, at least one foot of Our Lady is visible, to prophesize Her crushing the head of the serpent. I don't like the background colors too.

By the way, the translation says Immaculate Conception instead of Incarnation, guess that is a mistake, please correct it.