I actually like the whole idea of a drawing of an item turning into an actual item (although this picture shows how the artist made the drawing look very realistic.) Perhaps we can use this idea with a theme of fantasies or dreams coming true.
On dry paper, paint the shape of the droplet using the same colors used to paint the petal or leaf. It should be slightly darker on the side that is nearest the light source. ~You can lighten the opposite side of the droplet by adding a tiny drop clear