. . .been working on a game rock cliff tile that will hopfully be able to use on a range of turrains like grass and sand ect.
Good improvement. Are you thinking of doing a palette swap to use this
same tile for multiple surface types?
Looks like a rocky mountainside. Maybe try less rounded, more angular. That'll give a more rigid rocky feel. Less dither for a less sandy look, more solid.
If this is supposed to be flat walkable ground, I'd make it less bumpy.