Seems to be a need to make sure you're getting proper exposures, although I find that can be tricky with snow (which we don't get a lot here). Watch the hair - lovely girl but there's a hunk bunched up on the right on this one, and it's chopped off at the bottom; in profile it goes down her back and kind of blends in with the snow. Needed to check, smooth, arrange the hair as she moved from one pose to another. Think about where you're putting the subjects in relation to the backgrounds; the portions of snow make for light color shapes against darker areas. Notice everything in that rectangle of a viewfinder, make sure everything is where you want it to be. Slow down and take time to compose your images instead of shooting so many, go for quality more than quantity, instead of firing off the shutter think about what you're doing.