Okay you have
38 colors in that image. That isn't even remotely necessary, and it's clearly counterproductive.
You can easily make a clearer picture with only 8 colors.
I'm not going to clean up all these bricks, but this edit should show you what you need to know.
As I said, there is
too much noise, all the highlights are doing nothing but obscuring what you're trying to convey. There is no good reason for the highlights to be anywhere but the top pixel row of each brick at this resolution.
Second, doubling up the pixels at the gray border doesn't help; you want the illusion that they're a different color but on the same plane.
Like I said, add some variety to your bricks.