Hi Pedro,
Overall I think it is looking rather great, despite the washed out pics.
I see what you mean about something missing though. It's hard to say based on the pics but I would suggest to increase the contrast by adding extreme shadows, like Paul suggests above, and by highlighting the lightest green a little on a FEW selected places. And you could add some wear on extreme edges by mixing in some Iraqi Sand to the base mix. It just needs a bit more 'pop', other than that it looks great.
My compliments on the regularity of the pattern.
Cheer,
Adrian