The cherubic babe in Fra Angelica's lovely portrait is worth studying, for the coloration of the cheeks and the fine shadows of the infants curly hair. For me  the best way to look closely is to try to depict it in Prussian Blue.  The result here is nothing at all like the original, and so wide of the mark in proportion and detail that if I didn’t make a scribbled note where the drawing came from one would never guess. But it is about looking, the hasty sketch a reminder of Fra Angelicas dazzle.