How to alternate image on left/right using "Views Parity Row" module
You can just set all view-rows to be left and then do like this in your css:

.views-row:nth-child(2) {
   float: right;
}


UPDATE:

.views-row:nth-child(odd) {
  float: left;
}
 .views-row:nth-child(even) {
  float: right;
}


As @No Sssweat pointed out you can use nth-child odd and even to style every second element. You don’t need to style on the parent just use above code.

I actually wrote something wrong you can add nth-child on the .views-row elements