Well first show us a shot of the material with all textures combined so we can judge the final result.
As far as bricks go, horizontal rows should be offset like in your refs, that's what makes a wall stand up if you've played lego.
Then there's the space between the bricks. Assuming it's cement, it should look less like the bricks are "floating" in it and more like it's just here to glue them together. Leaving the tightest room for movement and exploiting the weight that bricks push on each other is what gives the wall its poise. Right now you'd think your texture is floor slabs with dirt in between.
Before you try yourself at cracks try to improve your material definition by adding more noise and sharper edges (claypolish and noise in Zbrush are useful). Personally for cracks I would use a combination of dam standard, trim dynamic and rake, but remember that cracks shouldn't be uniform and should correspond to the strain spots in the wall.
Well it looks like a stone tile floor combined with a brick wall mixed with a selfmade floor. Either decide on a brick wall and remove the rotated/vertical ones like Megacorpse stated, or do a floor texture out of the square ones. Tate Mosesian and Brad Smith got nice videos on that topic. https://www.youtube.com/user/bradhb3d/videos
Honestly, first thing that throws everything off are the bricks themselves. You have so many different sizes and shapes...and no real pattern for them.
Got any ref for the type of bricks you are trying to make?
Keep in mind that unique shapes will show up as a distinct pattern when you tile the texture. The one small brick nestled among the 4 larger ones will certainly stand out. Try viewing a larger sample - 4x4, for example - rather than a single instance.
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As far as bricks go, horizontal rows should be offset like in your refs, that's what makes a wall stand up if you've played lego.
Then there's the space between the bricks. Assuming it's cement, it should look less like the bricks are "floating" in it and more like it's just here to glue them together. Leaving the tightest room for movement and exploiting the weight that bricks push on each other is what gives the wall its poise. Right now you'd think your texture is floor slabs with dirt in between.
Before you try yourself at cracks try to improve your material definition by adding more noise and sharper edges (claypolish and noise in Zbrush are useful). Personally for cracks I would use a combination of dam standard, trim dynamic and rake, but remember that cracks shouldn't be uniform and should correspond to the strain spots in the wall.
Got any ref for the type of bricks you are trying to make?
I made another one following your advice.