Gosh! nice work here! Especially the paintjobs!
May I ask, what do you base your bases with? The small woodenlooking flecks that covers the base and is sprinkled upon the rocks?
I paint the bases 1st with 2 coats
The big rocks are actually plaster / filler you put some in a plastic cup & some in a bag (for a flat look) let it go off then take a hammer to it and pick out the sizes you want and glue a couple to the base with PVA, after its gone off I paint them the initial coat is always panzer grey (looks like slate) then highlight up, this one was done with dawnstone but I've used various other colours a mud wash if its a grey highlight & a null oil wash if its a stone type highlight.
The rest of basing stuff is bought from the modelling shop down the road from me that does loads of train stuff but you can pick it all up on flea bay
Lather the base in PVA when the rocks are dried & finished
train ballast for the very small light grey rocks to break up the texture
Bit of fine dark brown (fine) sprinkled around normally edges and base of the rocks (I've some moss looking stuff somewhere as well)
Then course mixed autumn blend
It sounds complicated but total time per model isn't that much, you just do it in stages, I have numerous things on the go at any 1 time.
Any other questions on effects etc.. just ask and I'll try and answer