Thanks. DiegoAMaradona, startrack, dss1234, and fad.
美国的爱国教育确实有一手.
Because this is street photography, I usually set aperture to 8. However, #14, should use bigger aperture.
fad: for #16, I was in a long line to get into an exhibition. I took about 4 shots, this one might be the best I could get. I will show you how to PS like this when next slide show.
All indoor shots were hand-hold. It was impossible to bring a tripod in. 勤练铁手很重要. A faster lens or VR/IS will be definitely better choice. You may see I use high ISO for all indoor shots.