The rose petal mold is widely used in sugar crafts. It is also great for polymer clay rose. Add your petals to the mold and press to get the veins. Don’t worry if your petals are too small for the mold. I usually put 3-5 petals all at once. All you need is the texture, it will make your rose more delicate and realistic.
Read my tutorial here to see how to use rose petal mold.