How do you add imagery to a sentence?

Imagery is picture, so find a topic and elaborate on what it looks like . For Example, instead of 'the autumn leaves change color' you can elaborate on it by adding Words to describe the texture, color and the like, changing the sentence into 'The autumn leaves shone brilliant Oranges, the most ostentatious of reds, and were complemented only by the undertones of gold of the yellow leaves soaring through the evening sky.' In which I elaborated onto many subjects creating a mental picture. =)