Such paintings are favorites among Christian viewers. Your question implies you think there is just one paiting of this subject. This is not the case, there have been hundreds of such paintings over the centuries.
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A painting of the Virgin Mary is frequently called a Madonna, especially if she is pictured holding the child Jesus.
I presume you mean the painting by Hermann Kaulbach, showing the madonna looking at the baby Jesus. It is sold in reproduction by most poster shops. This painting is in a (not specified) private collection.
Placed her away from the center of the composition
Cimabue, Bellini, Raphael..
It is a pastel.