Maybe use a round or slightly oval plunge cutter instead of the exacto knife.
Also if using a cutter instead of the exacto, place saran wrap or the like over the fondant before you cut it with the plunger and it will give you cleaner rounder cuts. Good luck!
The Garden Baker
Have you considered painting them? I paint on fondant with petal dusts mixed with vodka, and it works very well. Here is a section of my tiger.
Sugar Sugar by SSmiley
