Botanical art is not my specialty but I love to render flowers and plants because they can have such amazing detail. And, contrary to what I do most of the time, I have found that a dark background works a whole lot better with plants than it does with animals. As with most of my work, I model the flowers in Blender and ZBrush. One of the challenges of making a realistic render, more so than with animals is how the material behaves. The render below of a Ceropegia sandersonii was particularly difficult because it needed a lot of subsurface scattering without losing too much detail. Therefor making the model did cost me less time than I worked on the material of the flower.