How do I create rose petlas?

Hello everyone,

I just put together my first 3D prniter and now I am trying to get in touch with my artistic side. Currently I am trying to create a rose, but I am having trouble with it. I am working off of the design in this link. The interior petals were no problem , but I am having trouble creating the over lapping petals in the 3rd and 4th layers.

I have been trying to create a sweep feature using spline curves and then creating a circual pattern, but it does not look right. Is there a different way I can approch this? Thanks for the input!

http://www.123dapp.com/project/3D-printed-rose/1840624

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