These are some honest opinions after seeing your pictures. I saw that you need to pay more attention to the followings:
- When you compose(either frame in camera or crop in post process), be careful where you 'cut', avoid cutting through people's neck, right through their faces, etc. In one of the picture you even cut the bridge's face...
- In most case it's always better to take people at their eye level. This is not a rule as some time people want to exagerate cuteness of pet or tinyness of children, but when taking eldery in a formal proceeding, better to keep at eye level or below.
- Avoid out of focus foreground object. Quite a few shots with poeple's blurred out hand/head/shoulder sticking out... Avoid those.