The weather can be a problem. It is difficult to forecast in advance. In the past, the best time was in the mornings. These days it’s difficult. I have to be flexible It might be possible to switch days. (The only time it isn’t possible will be if I am traveling somewhere.)
There is some walking involved across for scenic pictures. The fields can be muddy or the farmer has spread the field with manure.
Strong winds can also be a problem. You don’t want to be on an exposed mountain location with strong gusts of wind.
Finally, the sun can also be a problem. At certain times of the day it is in the wrong position. It is also lower in the sky during the winter months and sunset is earlier.