Are you modeling this wall or is this just a displacement texture viewed from an angle?
I would strongly recommend doing the former if this is the whole point of the image, as it is not like you need to put together thousands of bricks.
Right now, the main critique that goes against the image is that it looks like a feature test, there is no focal point or even so much as variety that changes as you look around the image. Maybe a brick could be missing or sticking out, maybe a plant took root in a crack, who knows.
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Tile material is too shiny. They look like they are glazed.
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You should make the grout/mortar joints look more rough. It should be more like a sand texture