When writing the effect it is the 'effect' of the technique used, how an audience/viewers/readers reacts or are supposed to react to it, and the effect it has on the entire concept and how it emphasises (or does not) it.
Okay, here's an example of what a paragraph should be like:
(Robert Gray's poem 'North Coast Town.')
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TOPIC STATEMENT:
The creeping decay of commercialisation is one important issue Gray deals with in the poem. Americanised architecture and overdecorated shopfronts clearly indicate town people’s desperation for tourist dollars. As the persona hitches a ride, he comes to see various superficial sides of the place.
EVIDENCE/EXAMPLE:
The garish “pink ‘Tropicana’ motel”, “RSL” that Gray describes as “like a fancy-dress Inca”, and “Coronation” immediately reveal the town’s pathetic commercialisation.
EFFECT:
Using alliteration in describing those cheap “stucco… sea shells” veneer on buildings, the poet creates a stronger sense of the area’s completely idiocy and lack of depth. Gray suggests that the town has lost its original nature; everything is borrowed from foreign cultures.
ANOTHER EXAMPLE/EVIDENCE:
"They're making California"
EFFECT:
Using metaphor the poet directly criticises the excessive Americanisation that is going on in this Australian town. The visual imagery of Gray’s reflection that “flaps in shop fronts” is again symbolic for the hopeless duplications everywhere.
LINK:
Commercialisation corrupts the town. In this poem, Gray comments on the town’s crass commercialisation that is superficial.
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I bloody hope this helps. Time went into sorting this out.