Great 1st LF image!!
If I don't trust the 1 or 1/2 second speeds on a shutter, I close down another stop and use B. "Exercing"' the shutter might help with those speeds, maybe not.
In dark situations, to see the image on your GG easier, place your eye on the line the light is traveling along -- in better words, if you want to see into a corner of the GG easier, look at the corner with your eye in-line with the center of the lens opening...where the light is coming from.
135mm is fine for waterfalls -- just learn to see with it and where one needs to be to set the camera up. There is no regular lens that is not great for waterfalls, it will be the eye and experience of the photographer that will determine if it a focal length works' best 'or not.
Have fun!
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