I don’t know if you’re looking for photographic composition advice, but generally, I’d say: (1) cut out elements extraneous to the core concept of each photograph, and as one means to that end (2) crop closer and fill up more of the frame with your subjects. My favorite shots were these: http://ivzhao.com/photography/pics/randomone15.jpg • http://ivzhao.com/photography/pics/light2.jpg • http://ivzhao.com/photography/…
Glad you like the photos. However I usually don't associate concepts with my photos and like to response to scenes instinctively without thinking too much about composition. Thanks for your advice nevertheless.
(For what it’s worth, the vast vast majority of my own pictures suck; it’s only through culling and cropping, and lots of practice, and hundreds of hours spent staring at prints, and then more culling and cropping, that anyone ever ends up with anything presentable.)