Make princess features one day in advance. Make royal icing. Tint yellow, copper, brown, black and rose or violet. Reserve some white.
Tape princess pattern to cookie sheet; cover with parchment paper.
For crowns, use tip 1 and yellow icing to outline and pipe-in. Pat smooth with finger dipped in cornstarch.
For heads, use tip 12 and copper or brown icing to pipe ball on parchment paper-covered cookie sheet; flatten.
For torso, use tip 12 and rose or violet icing to pipe teardrop bodies on parchment paper-covered cookie sheet. Use tip 8 and rose or violet icing to pipe pull-out arms on bodies.
For hair, use tip 2 and brown or black icing to pipe hair on heads.
For flowers, use tip 225 and rose or violet icing to pipe drop flowers. Use tip 2 and white icing to pipe center dot.
Let all dry.