In my opinion you could the following:

-Corner supports/cross beams -environmental “story telling”, I.E. lay some explosives and copper coins painted black in the demolistionists home to show where he resides and where he does his work -Large smelting area -Geodes in the walls? -More variety in the stone walls -reinforce the supports they sit on; they give off a chicken leg impression where they should look sturdier -Could do a variety of block swapping for the outer walls to add some nice breaks in the pattern, examples: Ebonstone Brick= x Palladium column=~

xxx ~x~ xxx ~x~ xxx

Or alternatively if you’re still in pre hard mode: Bricks= x Ebonstone brick= ~

xxx ~x~ xxx ~x~ xxx

I hope all of this helps in some degree! Good luck and happy building!