Take a 30 gauge wire, dip it in edible glue, and carefully insert this into the raised ridge. Gently pinch the edges of the petal to give them a little realistic frill. If you have a petal veiner, lay the petal in the venier and press down firmly. This will give the petal veins and contours to make it more realistic, This can also be acheived with some patience and a thin modellling tool.
Once the marzipan is draped over the cake, gently pull down the sides to cover any gaps. Smooth the flat of your hand down the sides, pressing the marzipan to the cake and amoothing out any creases or overlaps, Rub the flat of your hand or a cake smoother over the top firmly to flatten and smooth the surface. Smooth out the sides in the same way. Trim off any excess marzipan around the bottom of the cake with a sharp knife and peel it off the board. This can be kept in an airtight bag or container for use next time.