You recognize the freshness of bliss in their faces.
You recognize in their faces the joy of bliss
and in their faces you shall know the radiance of bliss
Thou recognizest in their faces the brightness of bliss
You know in their faces/fronts the blessing's/goodness' beauty and goodness (brightness)
You can see from their faces how delighted they are
You will recognise the freshness of serenity on their faces
Thou wilt find in their faces the freshness of bliss
You will find on their faces the glow and freshness of bliss and delight
You shall find freshness and bloom of bliss in their faces
You will recognise in their faces the brightness of delight