For my part, though I'm no expert I think the textures, both horizontal (green) and vertical (brown/earth) look fine, and very usable as your intent defines.
A variation might be a few "tiles" coloured in asphalt and concrete for urban settings, though such a set might easily be a second option by simply having concrete texture on the downside face of a hex-tile opposite (obverse to) the green of the grass. That way, the brown earth would do "double duty" as vertical texture in either rural or urban mode. {Turn this by 90 degrees >> concrete|brown earth|grass; because you already have >> uncoloured|brown earth|grass. I hope I have expressed the concept clearly!}
Just a very humbly offered suggestion Tirick my friend, in an attempt to avoid having to do several texture sets for a tileset where 3 textures might well be sufficient.
I very much like the look of the 3D hextile set you have shown here.
Kind and Respectful Regards Tirick my friend, Uyraell.