I wasn't really happy with any of them honestly, but they loved them, so I guess I did ok.
My friends (and family) tell me the same thing, even about my worst, most craptastic photos. Don't believe it - they mean well, and probably do think our photos are wonderful, but it's not a valid measure of our work.
Anyway, my opinion (for whatever that's worth - lol) of these photos is:
#1: Nice. I like the beautiful reflection, the lazy feel, the family of ducks. Seems a bit underexposed in the trees, and a bit cold; I'd work on the color balance a little. It might be tilted slightly to the left, also, so I'd fix that as well.
#2: I don't like the vignette. The faces need more light. Slightly OOF. Tree coming out of man's head. Too much yellow?
#3: Better light in the faces, here. But... Sky blown out behind heads makes a harsh contrast. Faces are OOF. Vignetting, again. Horizon feels tilted. Man looks frustrated or something, and his left hand looks baked or something - eek.
#4: I'd crop this closer. Interesting light (on-camera flash?). Nice leg(!). Wish she was looking towards or at the camera.