Figurative language really comes into its own in descriptions, and thus you might like to analyse some of the descriptions that this excellent short story gives us of the veldt that the nursery walls create and the emphasis on the lifelike nature of the animals inside of it. Consider the following description that we are given of the lions, for example:
And here were the lions now, fifteen feet away, so real, so feverishly and startlingly real that you could feel the prickling fur on your hand, and your mouth was stuffed with the dusty upholstery smell of their heated pelts, and the yellow of them was in your eyes like the yellow of an exquisite French tapestry, the yellows of lions and summer grass, and the sound of the matted lion lungs exhaling on the silent noontide, and the smell of meat from the panting, dripping mouths.
Note the way that the colour of the lions is compared to the colour of "an exquisite French tapestry" through the use of a simile and the sounds that the lions make is likewise conveyed through the use of onomatopoeia in "panting." The use of such figurative language obviously helps convey the reality of these beasts, that, as George Hadley and his wife will find, are a lot more than mere figments of his children's imagination.