Sumatran keris for discussion

[kai]

Below is the picture of the blade. Let's discuss...
This is the 1st time I saw this type of greneng-works.
What does these represents?

If you're not too strict, the first greneng (downwards from the tip of the blade) might represent a bird's head (most likely an eagle?); of course, this is just one of several possible interpretations.

The rest (or possibly all) of the greneng looks like foliage-like decoration to me.

Regards,
Kai