I like the reference idea for the eyes/boobs, my only concern is that psychologically speaking the viewer seeks the face in a illustration/ the eyes to have contact first and then involuntarily follows the direction of the lines in a composition. So having both a head and the eyes on the upper torso, will be confusing. You have to find a solution for this visual problem, if she is sooo big that she eats the sun, maybe you can't even see her head, and the eyes on the boobs fit then, like in your image above, or cover her boobs and concentrate on the head.
And always ask yourself, why is that there or why does it look like that. If you find a plausible/logical explanation, then it's working for the concept, and anybody who is looking at your concept will understand it ^_^.