Harvard Square night shots

Okay so admittedly these shots didn't come out as good as I had hoped (after all, I'm a newb), but I wanted to post them anyway. I welcome tips on how I can improve these images from any non-newbs! 

In the first two I obviously wanted to capture some movement. They were shot with 1.3 and 2 second exposures. You can see how much less than a second makes a big difference - you can barely see people in the second shot. I think I would be happier with an image somewhere in the middle of the two. 

I was happy with the lighting and composition in this next shot of the street artist but there was a bit of camera shake and there could have been more focus on his face. I suppose I could have used my tripod to prevent the camera shake with the slow shutter but then I would have been the creepy girl with a tripod.