You say 'tis hard to copy well, Where nature does herself excel. Allowed—yet still let me advise: Near as you can, to nature rise; Nor time, nor colours will be lost; The draught will more than pay the cost. Then dare to draw that angel face; The pencil may the features trace; And, should her air thy art defeat, Add wings, the piece will be complete.
Mary Barber (1685-1757)