Dune is complex and doesn't have any easy, happy friendly notes, in spite of some citrus--not that those types of notes automatically make something cheery since they can be mixed to all kinds of ends. But I'd more accurately call Dune moody since it changes in a way that is like the ocean breeze blowing sands around (marketing works).
Dune's most prominent notes to me are all the heavy, minor key left side of the piano things like resins, incense, mosses, woods, and instead of coming off as rich, they are kicked up over and over again by the aldehydes like that same piano has its pedal being pressed down to make the deep notes echo.
Since Lily is the most prominent flower (the only one noticeable to my not very refined or experienced nose) I notice that Demeter's Funeral Home is a lily also, and this note conveys an austerity or mourning culturally.
The film noir-like complexity and uncaring mother nature is merciless-type self-containedness of Dune make it sometimes feel bleak to me (it's all Greek to me, too, though).