As always with your maps, D, the landshape is pleasing to my eye and the overall composition feels very natural. I also like the lore you shared. So...
I don't really have any tutorials; I learned how to do the relief from a tutorial on the Guild though, its by Ascension, if you search for his Swiss...
See, this is why I love the Guild - so many new methods, ideas, things I never would have thought of, and tips on cool software. Now I gotta try out...