Your render time is so long because of the marble material. I don't know why but that takes forever for some reason. Take a look at the link and see if any of the materials are close to what you want, and then you can down load them and edit them so they will work. All of them are relatively fast. For a rose bush, go here: http://3dmodelworld.com/3dsmodels3.asp http://3dmodelworld.com/3dsmodels4.asp http://www.3dcafe.com/asp/plt_pics.asp whichever one you choose, make the leaves slightly transparent and it will look great with the volume light.