#1: main issue is IQ / aperture f/3.5, ISO 1600, 1/13s, 18mm*1.6 - would suggest resting the camera on something, closing up the aperture, using ISO 400 or lower...
#2: very good shot, good moment to capture and a good composition
#3: upper and lower parts don't seem to relate...?
#4: excellent... as gyounis says, lots of personality. Tones work well through most of it. Of the four, this is the only one where we can see facial expressions and understand the inter-personal context - gives a hint to character, and a bubbly mood. Charming.
Cheers,
Tony