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If I understand the goal correctly, I would actually change very little! (Although I'm not a designer either.) So my understanding is that each gray "rectangle" will contain some kind of image or icon or graphic, representing the subject to which it will be linked. Or perhaps the gray "rectangle" will be replaced with the graphic/link? Or maybe they will be like buttons for clicking? Will the arrows be clickable as well?
I'm concerned about the size. At the current size, it will be very difficult to accurately click on any particular rectangle, especially in the middle ring....much less see whatever graphic they might contain. So unless there is some limitation about the size, I would make it MUCH bigger. Or perhaps you intend to do that eventually anyway?
When it's bigger, it will be easier to see that the arrows are arrows. Right now I have to look closely to recongize the shape. I'm wondering if there were more white space around the arrows, if that would make them "pop" better. It would certainly have to be bigger, or the rings of rectangles narrower, to make more white space around the arrows.
I would make the human figure darker, and probably black. Unless perhaps you plan to put another, perhaps already existing image of a human figure there?
If the ring segments (red and gray "rectangles") and/or arrows are to be like buttons for clicking, I might download your file and try to make some fancier ones. Are the red and gray colors required? There are other members here who are better at designing, who could probably do better than me though.