This question is highly related to this other one: What is a point of interest in a photograph and where is it lacking in this candle picture? Your photo here does not really have a natural point of interest other than the bright splotch of color in the middle, so that's where attention goes.
In addition to the bright color and central position, it's more in focus than the rest of the image, which discourages exploration of the other parts. The word "focus" has two meanings: first, the convergence of rays of light (making a sharp subject), and second, the center of attention. It's not really a coincidence that we use the same term for both. But the pink petals aren't really all in focus either, leaving me unsure of what you're trying to say.
If you would like to emphasize the color over form, you might try an abstract composition with more blur across the entire frame. Or, you might go the other way and try for more depth of field so all of the pink flower is in focus, and more of the branch. It may be hard to get the background smoothly blurred in that case; you may want to try different focal lengths and camera position.
As an exercise, I suggest trying several different crops of this existing image to see how they change the meaning, both to you and to your friend. Personally, I think the most interesting thing going on in this image are the blurred twigs and orange flowers diagonally to the lower-right of the pink flower. I might choose a crop to draw out that detail:
This also de-emphasizes the out-of-focus areas of the pink flower, by pushing it to the edge and making it large enough in the frame that it looks like a multi-part object which one wouldn't necessarily expect to be entirely in focus.
But this is my interpretation. It does not emphasize the interplay of shades of green that you say you find interesting. Try to find what brings out that meaning.