Well, now... It's been a very long time since I've had a go at one of these!
Here's my humble effort... edited in Lightroom 6 as follows:
- Significant crop to the area of the photo that drew my eye, and 1:1 aspect ratio
- Rotation and vertical perspective distortion correction
- Exposure, contrast, clarity and saturation adjustments
- Color adjustments in Nik Color Efex Pro to give it an Autumnal / Fall look
- Localised exposure and clarity adjustments
- Spot healing / cloning to remove a few distracting leaves and fungus / algae marks on the rocks
- Mild vignetting
- A little sharpening
I'm still not quite sure I have it exactly as I envisioned it, but it's pretty close, I guess...
Thanks to the OP for posting. This was fun, especially after such a long break!