Good start dude, the first obvious crit would be that how each row of bricks lines up doesnt look right, they're too closely lined up on top of each other, no brick layer would lay them like that. However I'm really liking the bricks themselves :)
hey Substance Designer And Zbrush Personnal Work 01. sloppy brick wall Material study of a sloppy brick wall created in Zbrush and Substance Designer. https://www.artstation.com/artwork/XBZgrn
Why not just have a combination of texture and geometric detail on the floor? The smaller and flatter bricks could be just normal mapped, while the larger and higher bricks modelled.
Here another attempt at the tiled brick. These were made from the 3d bricks. Sry to keep coming back to this but I really want to hammer this down now.
That lava material is fantastic! I do agree though that the bricks could use a similar treatment with some deeper grout, and slightly broader edge wear on the bricks.
The brick and concrete MAT that I am working on for4 my Garage. This decal will appear above the bricks only on the concrete and only where the verts are painted red.