If you already know what I suggested, then we can talk about the image.
IMO, the major problem is right at the arrows.
Her figure disappears into the clutter.
If it is sharp enough, you can mask her outline, grab the light tree on the left, flip it horizontally and slide it behind her so that her torso is against the bright leaves.
Then do the same thing for their clsped hands using the bright path.
That way you'll end up with them outlined against a bright background.
You might be able to skip much of that by increasing the luminance of just the green foliage.
I suggest you do all this before you convert to BW.
Gimp can open layered tiff files so if you are willing to send me a high res color image, I will try it and return a tiff file with layers so you can follow the process.
If you want, just send original using wetransfer.com (free) to
lew@lewlortonphoto.com