Cottage terrace railing ideas

We are looking for ideas and options for some kind of a railing that will keep people safe from falling off the top terrace of our cottage garden. The challenge that we face is that it is an irregular shaped terrace and the edge has rocks of varying heights that will need to be dealt with. We want an organic look that will not impose on the view out onto the lake below nor clash with the living wall of rocks and plants that it will sit on top of. We installed large wooden posts and a temporary wooden railing but this isn't working for us as it seems to close in the space. We were thinking wire or glass but we do not want an industrial look.
I am attaching some pictures of the space for more detail.