That looks really nice Greenmutze, great job! One thing that stands out is that there is quite a bit of empty space on the texture. I'm guessing you don't want to edit this piece but if you moved the small square to the top left of the texture you would have some decent space to add more.
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An awesome example of this is what Jessica Dinh has done here:
http://www.polycount.com/forum/showpost.php?p=1686072&postcount=48
here i have some more rock stuff for you