Yellow And Red Rose In The Light
I used side lighting for this rose because that creates the shadows that reveal shapes and textures.  The flash was a Yongnuo, in manual mode, in a 24 inch gridded soft box positioned at camera right at 4 o'clock.  Fill light came from a hand held mirror at camera left.

I've photographed a lot of plants and flowers, because they're all around us, work cheap, and never complain. I have an album of these images with over 1200 pictures, and for each one, I have described how I lit them, in case you're interested in that kind of thing.
<a href="https://www.flickr.com/photos/9422878@N08/sets/72157628079460544">www.flickr.com/photos/9422878@N08/sets/72157628079460544</a>

Other pictures that I've taken of roses are in my creatively titled Roses album.  
<a href="https://www.flickr.com/photos/9422878@N08/albums/72157624084160734">www.flickr.com/photos/9422878@N08/albums/72157624084160734</a>
rose rosa fleur flower flor offcameraflash color colorful yellow red sidelighting yongnuo yongnuorf603n homestudio blackbackground griddedsoftbox shapes shadows tabletopphotography macrolens