I think you are suffering with a common Velvia problem that scanning not only adds more saturation (mostly due to an increase in contrast) but also the interaction of flourescent light sources with the dyes in Velvia can create a magenta bias (or a bad icc profile possibly).
This is evident in a couple of places, firstly in the extreme cyans that would have been bluey-greens in the original subject matter and secondly in the colour cast in the small waterfall.
I've had a play with the image to get it looking how I would want it (not necessarily how it *should* be or how you might want it).
Firstly a reduction in saturation.
View attachment 51468
and secondly a reduction in magenta and a neutralisation of some of the extreme cold cast from the blue sky
View attachment 51470
Also, Velvia does shift rich blues toward cyan in the highlights and so it's always useful to underexpose a little when shooting something that will have very bright, rich blues.
Hope this helps or at least adds a little useful to the thread.