"Burnt the fire of thine eyes?" - The Tiger by William Blake

The fire mentioned is an extended metaphor. It is referring to the Tyger's ferocity and mystery. It also shows the fiery energy the Tyger has within.

"The Tyger" is an apostrophe whenever it is stated. The Tyger is mentioned in order to avoid saying general statements and make a specific target the the author is addressing.

In these lines, personification is used to show the lamb having clothing, which is actually just its wool.

"Gave thee clothing of delight,

Softest clothing, woolly, bright;" - The Lamb by William Blake

The lamb is a metaphor for the child speaker. In Christianity, Jesus is compared both to a lamb going to the sacrifice and to a shepherd who protects his flock of lambs and sheep. The child is part of the "flock".

I a child, and thou a lamb,

We are called by His name." - The Lamb by William Blake