its helpful because it can give the reader a specfic idea of what the author is trying to get across. for example, if the author describes a frog, but he gives a description similar to a lizard, a picture of a frog may help the reader better understand he was describing a frog.
Hey! I hope you are doing okay, and here is my answer with my own words, all I hope is you turn my words into your own :)
Illustration is a very important text feature because it provides an imagery to the reader. Illustration is what makes a story more interesting. It provides a base for the imagination the reader can create in their mind.
Honestly I hope this is what the question meant. Good luck!
