Lovely image Georg and just a nice amount of movement.
I'm not sure what you mean by 8 sec exposures x 11.
Obviously it's daylight (sunshine) so an 8 sec exposure would require a seriously low ISO rating plus ND's (plenty) plus a tiny aperture.
Are you saying it's 11 seperate exposures each of 8 seconds? I'm not quite comprehending.
The movement in the clouds looks consistent with an 8 second exposure on a windy day but the movements in the grass are quite ambiguous.
Also, am I right to think that the wind was coming from behind you at about a 45 degree angle to your left shoulder?
Sorry for so many questions but I am intrigued.