I'm a fan of shallow depth of field too, but there are certain images where it works and some it doesn't, it's all down to overall style. Personally, I like the idea of a single eye in focus. A different angle and it might not work, but I think it works in #3, based on the overall processing and style. It's very easy to have all wedding photos looking the same, but it's good to see a little more creativity. In fact someone recently asked if I did weddings, as they didn't like traditional wedding photos, but I usually run away from people if I can get away with it
. If anything, I find that the colours in #1 are a little oversaturated, based on the green in particular, as it draws the eye too much. However, the skin tones are a little washed out, but that is down to the harsh lighting rather than any deficiency in technique or equipment and you can't exactly postpone the wedding until a day when there are overcast conditions. While in some ways a full frame is a better choice for weddings, I don't think it makes a huge difference, you simply frame differently or make a different lens choice. Of course, the best of both worlds would be to have both full frame and crop.