My only suggestion for on my Grunt - the blood on the armored parts are inverted. They cause a indent - whereas the blood would be on top of the armor. So it should be partially elevated there instead (or flat to the armor). Easy to do it, just simply make the blood VERY bright when doing the normal map. So then Crazybump will then elevate it - or if equal brightness to the armor - make it flat.
Arms you could do the same with as it on top of the skin - HOWEVER - the indenting actually makes his arm look all scarred - so leave it

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