These two fills are virtually the same, it's just that Leaves come to a point.
For leaves, stitch a leaf shape, then echo it, either inside or outside.
Continue adding leaves, stitching over previous stitching if necessary to get to a place that needs filling.
Teardrops are made the same way, just without the pointy end.
Remember, backtracking helps to get where the design needs to go. I hope you'll give this a try!