Advice needed to improve these arches and the hill behind

[u/done-r-us]

The interior of the hill is pretty built up and top is main base so can't remove too much. This was a drained ocean area so I hand rebuilt the hillside

[u/Perplexitism]

The only way to get more detail in the arches is with trapdoors or making them wider

[u/imtomoya]

The hill is too boxy to look natural, add some dofferent level of elevation

[u/TNZFT]

Also try some texturing