What struck me first about this image is the light -the way it plays across the petals and adds strong contrast to the stem. Light is one of the tools that a photographer can use to add depth to a photo and that's certainly the case with this image -well done!
The photo also has a very strong composition, since the stem leads the viewer up to the flower which is positioned diagonally in the frame. The focus and limited depth are also perfect, with the leading edges of the flower's petals in focus and the trailing petals getting soft, so that the viewer's attention stays focused on the near side of the flower. Also the limited depth of field adds to the three dimensionality of the image.
I can see the imperfections of the flower, but the bokeh and color creates the illusion of a painting -brilliant!