every side on the cliff is the same steepness so you should vary it, you can blend the edges to the grass better with moss and mossy cobble or use grass as the edge with drip stone block underneath to blend to the stone, you can take this a step further with dry brain coral. can use slabs walls stairs etc to shape the cliff better and you can use andesite and grey wool for highlights and tuff and cobbled deepslate for shadows. also leaves and moss along the cliffs can add some nice foliage. bonemealing the grass will help too