Of course you don't have to make impressions.
Glaze dish white - place leaf over (PVA or Elmers will help) - spray green - leave leaf in place and fire.
DSCF2395-c-r-f.jpg 393.58KB 10 downloads
Another way (not my best result, I forgot to photograph that one before it sold) is to spray a leaf with glaze and just place on a glazed plate/dish before firing.
DSCF2406.JPG 94.5KB 8 downloads
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