Old photo of a rose, but just to give you an idea of how to make a rose using a piece of cellophane or a small plastic bag
Start by making a small sausage-shaped piece of marzipan, approx. 4 inches/10 cm.
Cover the marzipan with the cellophane and use your thumb to flatten it. Make one of the longer sides thinner than the other.
Remove the plastic and roll the marzipan into a spiral shape, thin side up.
This will form the center of the rose. Don’t roll it too tightly. I stop here, but if you like add more petal layers.
Slightly curve the edge of the petals out with your fingertips.
Pinch or cut excess marzipan off the bottom of the rose.