illustrate a science fiction book for young adults

I am looking for an illustrator to help bring to life the science fiction book I am writing for young adults. I want the illustrations to be realistic, without being too life-like. Rather than have specific scenes or characters in mind, I'm open to the illustrator's interpretation as to how they would bring the world of the story to life. I only need somewhere between 1 and 10 illustrations, the amount dependent on the illustrator's capabilities. If you can think of a way to make the readers feel as if they have stepped into the world of this book, then this is the perfect job for you!