How does Frank Herbert use imagery in Chapterhouse: Dune?

Examples of Imagery:

The comeyes showed Murbella defying post-coital fatigue to leap from bed. Moving with blurred speed (much faster than anything the Bene Gesserit had ever achieved), she kicked out with her right foot, stopping the blow only a hair's breadth from Idaho's head.

She swam to the shallows and looked up at a puzzled Tamalane. Tam's robed skirts were dark with splashings from an unexpected wave.