Here is a slight variation:

yea, agreed.   Slowly but surely I'm getting there.   I'm going to add more variation and diversity to the surfaces.   I have to say though I am getting much faster, and developing some good techniques.   Eventually I'll do some tutorials when I am 100% confident in my methods.

Thanks for the feedback.

I don't think the moss comes out strong enough - looks more like green paint that was dripped around and has faded over time.

I agree, the mossy spots aren't coming across well.  One thing I would do, is try flattening the whole thing, duplicating that layer, adding a good bit of noise to the duplicate - then go in with a low opacity eraser and start erasing away the new, grainy later.  You should be able to add a little messiness that way.

not so keen on the moss, they have more texture to them but they are allot more blurry now. Needs to be sharp for a texture imo.

Much better than the last one!

Two complaints:

1. there should be more contrast between the grout and the stones.

2. the stones should vary more in color and possibly texture.

I really like Grim's lichen, it would go well with grey stones.

Finger- your moss besides being blurry isn't subtle enough.

ok..spent a few more minutes on it.  Less moss, monochromatic noise, little messier.  Still not perfect; I'm sure Grim will do a better job of it in the end.