As an adjective:
* The diminutive figure of the child was dwarfed by the towering oak tree.
* She wore a diminutive hat, barely bigger than a thimble.
* The diminutive size of the hummingbird made it difficult to see in the dense foliage.
As a noun:
* "Tiny" is a diminutive of "tiny."
* The word "kitten" is a diminutive of "cat."
* Many languages use diminutives to express affection or to indicate smallness.
In a figurative sense:
* The new CEO was a diminutive figure compared to his predecessor, who had a larger-than-life personality.
* The city's once-proud skyline had been reduced to a diminutive silhouette against the vastness of the desert.
Remember that "diminutive" can refer to both physical size and the way something is perceived or represented in language. Choose the usage that best suits your meaning.