Look at your pics and review for yourself the compositional elements.
Some pics they look OK, but some pics you'll see that the main focal point element (ie, person, etc...) has odd things next to it that distract from the focal point of picture.
Hard thing to deal with when you're taking crowd pics. Much easier when you stage pictures and can adjust the elements to achieve the composition you want.
However, once you analyze your crowd pics and think about what you would do to strengthen composition, the next time you take crowd pics or other street scenes, etc, you'll probably make some adjustments before snapping a pic.
You seem to be pretty good with cropping your pics, many times people don't crop pics tight enough. My take is keep cropping until you think you can't crop further without losing the main point of photo...
Anyway, just my 2¢......