I downloaded from where you indicated. It only has one material zone? I had to do some dual-material hackery to be able to change the color fo the petals without changing the color of the leaves and stems. Did you re-map this with new UV's and new materail groups?

I think the shapes are a little too simplistic to be believable, especially on the inner petals.

Here's my WIP.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)