thanks again for the feedback and the suggestions.
in fact i agree with the expert... in the first levelenv the color of the green trees is a little off. but in my opinion it so not so much the brightness as it is the saturation. they are simply TOO green, i will adjust that.
as for the whole "gras-affair" i have to say that you have to see it in movement. banned in static pictures it does not look that good.
a little comment on sphere 2.0: well, i think the vegetation of sphere 2.0 pretty much sucks. i will not argue about the screens, they look amazing, but once you looked at the real time demo all hopes have gone... the placement is totally off, trees and plants pop out everywhere... it simply sucks...
do not take that the wrong way, i only say that there is a lot to improve.
i will change the texture set so that it will mach the dead gras

good idea, thank you, i do not know why the idea did not came to me before.
spike, can you elaborate what you mean by "dull colors"? maybe it is a question of taste, but i think (and psychology of colors backs me up on this) that only a harmonic picture pleases the viewer, and to be harmonic a picture only can have several matching colors in different tones.
damocles: please, please stick to the topics language, if you are not able to say it in english... well, do not say it at all. it is not fair to the english speaking users.
thanks again, i will be back with the upcoming environmentsets (still 6 to go)