I think it's looking better!
One thing I noticed is how the highlights on the bricks are set against the dark color, so the corners still feel sharp where the highlights meet the dark cement:
There's a couple things you could do here... here's a first edit I made (you can click to zoom in):
You can imagine for the corner pixels some of the highlight is hitting that corner, but not all, so it's not as bright as the highlight color. So what I did here was just take a slightly darker color than the highlight (the base color of the brick) and placed it in the corners. This makes the corner look not as sharp.
However this does have an unintended side effect of making the top right and bottom left of each brick look sharper instead of rounder:
I can go about making these corners softer the same way though, by choosing a darker color to soften those corners:
That's some brief process that's hopefully helpful for how you want the bricks to look. An assumption I'm making here though is that you want to corner to just be slightly rounded- there are times where you do want some sharpness, but usually when you want to define a harder edge.
For the colors, I would say you could probably push it more green. You mentioned "kind of unnoticeable" so that means you could tell that it was hard to see it was slightly green. So make more green until it reaches a level you think is good, like maybe "kind of noticeable" or "noticeable" or so and so.
I would also like to reiterate going through this tutorial on pixeljoint (
http://pixeljoint.com/forum/forum_posts.asp?TID=11299). It covers some of the fundamentals for creating pixel art as well as defining a lot of the terminology.