From left to right on the top image:
Above the saints is back of the Society of the Holy Child Jesus seal, depicting Jesus on the cross.
From left to right in the bottom image:
Above the saints in the front of the Society of the Holy Child Jesus seal, depicting the three interlocking circles and an equilateral triangle.
The followers selected are four of the most influential women in the New Testament, thus they are placed in a prominent position and flanked by four equally influential and recognizable martyrs.