Sorry my post got deleted while I tired to edit it
here it is again for anyone interested,
Yes that is the ENBseries I used
http://www.moddb.com/mods/graphic-enhancer
basically ENBseries has been around for years in various forms, a kind of forerunner of sweetfx it's mainly used to make older games look better by improving the lighting, other than that I have no other mods installed apart from what comes with Rome at war, some warband mods which are a bit basic to start with will possibly look worse with ENB, others which have better graphics to start with like polished landscapes will look better, also times of day makes a difference, all those pics are late afternoon or dusk, it's worth trying for screenshot purposes you can always enable/disable in game which is useful.