Thanks also to @Meeces for all the posts, keep up the good work :-)
Nice to see your region of the world. These huge redwood trees are really amazing.
I'd never heard of "classic neg" before, just looked it up and it's interesting to see the way the old films produced all those different results.
I don't use any such filters but take all shots in RAW and process the colours to how I feel I'd like the shot to look like, keeping it fairly natural but adding a little bit of brightness, pop and warmer punchier reds, which sounds a bit like the description of "classic neg" ;-)
With the bus stop in the shot you get a good feeling for that enormous scale of these huge trees!
It has a bit of the HDR feeling to it with the shadows and midtones looking somewhat brighter than I'd expect. Maybe you could experiment with darkening those midtones and shadows just a touch. It gives more contrast, the darker areas become more "separated" from the lovely bright yellow light behind in the forest which then seems to shine out even brighter and looks more natural and even more 3D.