I don't know the answer you seek, but I'll also be interested in learning (which is why I'm posting here).
With my highly limited knowledge, my guess is that your approach is wrong with regard to your one sprite copied five times. I'm thinking you'll need the following:
a sprite with 5 leaves
a sprite with 4 leaves
a sprite with 3 leaves
a sprite with 2 leaves
a sprite with 1 leaf
a variable for the health number
and when the health number variable is 5 it'll show your 5 leaf sprite,
then when the health number variable is 4, it'll show your 4 leaf sprite,
Anyway, I want to see the answer too.