Comments per req:
1. A really great shot; they'll both probably hate you forever, but it's a perfect candid capture!
2. Nice idea, however: You've got an exposure issue here in that the sun is coming from camera left, and that side of her dress is at least a full stop brighter than the other. Note the way the detail on her dress is almost grey toward image right. Ideally ask her to turn to her left and get the most even exposure, and, if necessary, use some fill flash. Also note the piece of wood in the background; that should be cloned out in post.
3. Nice but definitely over-exposed. Probably 2/3 of a stop or more. You're in a very difficult situation here, with black, white and a bright colour. Remember, expose for the highlights (in this case either the shirt or the brightest area of the rose). For scenese like this, carry a small grey card with you and meter that or use an incident meter.
4. Again, nice idea, but with some technical issues; this image is slightly under-exposed resulting in muted colours, and I think perhaps, the WB is off slightly. In this case a white card would have served you well. Also look at your DoF; there's too much of it.
5. Nice, but you've got some seriously bad perspective happening here. Notice the way the trees are leaning image left, but the behind the brid is vertical. Always make sure your camera is level and square to the subject plane.
6. Nice, but a little over-exposed (note the blown highlights in the child's sleeve), and excessive DoF. Also be cognizant of things like hte brown area at neck level; this could easily be cloned out in post.
7. This is where you as the photographer have to take charge. The groom is looking at something, but it's not the camera, as well, the bride seems to be squinting and has blown highlights on the lower, left area of her dress. Also be careful of your positioning. "Things" growing out of people's heads (In this case the white post) are never a good look.
8. Cute, but WB seems a little off to me, and cropping the people on the periphery might not hurt.
9. A classic, again WB and exposure issues, however there's not much you can do about it in this case; there's no do-overs for 'The Kiss'.
10. Excellent idea, good exposure on this one, but your WB is now too cold (blue). You definitely need to keep a white card handy and reference it every few frames.
11. Nice, good exposure, good expressions, but try and distance the subjects from the background in order to make a softer, less distracting background.
12. As per 11, and again, refer to comments for 7; in this case the 'Y' of the tree is behind both their heads.
Overall, they're good pictures. I've made a lot of points, many of which are fairly nit-picky, but posted with the aim of helping you improve next time. In general, be more careful with your exposure and WB; a grey/white card is very useful, and well worth having in your pocket. Also work on improving your 'background eye', that is, being able to see those little things that the average person doesn't notice, but become glaringly apparent in photographs.
Just my $00.02 worth - your milage may vary.
~John