"But you shall shine more bright in these contents
Than unswept stone, besmear'd with sluttish time."
This is the basic idea of the poem, that poetry outlasts architecture. The idea that poetry "shines" is metaphorical.
sonnet 18
i
Iambic pentameter.
sonnet
metaphor
sonnet 18
i
Iambic pentameter.
sonnet
metaphor
Yes The sonnet is dripping with metaphor
It makes fun of the blazon and exaggerated comparisons of beauty.
affectionate
It is the star to every wandering bark.
Probably either Sonnet 18 ("Shall I compare thee to as summer's day") or Sonnet 116 ("Let me not to the marriage of true minds admit impediments")
Metaphor
Dark Lady