Thanks for your reply Eastsider. Hm, my thought was 1) fun
thereafter to show how deep the snow is here, it's a long time ago that we had such a lot of snow and over such a long time. I made some other shots thereafter - footprints in the snow - a heart of snow and so on perhaps I have seen this more as winterseries with fun.
Yes you are right I have realized this dust on the PC already but was not sure if it's the sensore, the lense of my first hought was (hopefully in the snow) but it seems to be the sensor or the lense. I had a deep look onto further shots which I did thereafter and since I used an other lense and since I have no further distrubace (I think) it must be dust on the lense.
Today we have no further snow but it's still cold and we have a lot of ice on the ways where we have to walk it's really hard to go shopping or home without slip and fall down. They told us they do not have enough money to remove this ice from the ways ...