What you need:
Plaster cast kit (purchase here)
Flatten the lump of dough to the size and thickness required.
Firmly press down hand palm to form a deep impression.
Remove hand. Mix plaster with water, 2 parts plaster with 1 part water.
Pour the plaster into the playdough mould. Allow it to set.
Remove the plaster once completely dry. It takes about 1 day to dry completely (it also depends on the size and thickness of the plaster). Clean the cast with water and get ready to be painted.
Colourful little girl palm!
You can experiment it with other nature items or animal figurines.