Classic Poem

How can I finish what you have begun?
Can fire to ripen fruit assist the sun?
Should Raph'el draw a virgin's blooming face,
Exert his skill to give it every gr[ace],
And leave the rest to some Dutch-heavy drone,
Would you not rather see that face alone?
Or should Praxiteles the marble take,
A Venus head and neck and shoulders make,
And some rude hand attempt the rest from thence,
Would you not think him void of commonsense?
These hints I hope will move you to excuse
The first refusal of my humble Muse.
The task I must decline and think it just
Your piece continue as it is, a bust.