Woman talking on the phone, she was wearing some big rings:

Didn't really know where to begin with this sketch, so I just started in a corner and worked my way out... Initially there wasn't anyone in the frame when I started drawing, but I figured someone would step in eventually, and I could just add them in later:

Doing quick sketches on public transportation can be exhilirating, but at the same time it can be a little heartbreaking; when you come upon a subject with so much interesting detail you feel like you could sit and sketch it all day, but you only have a few minutes within which to capture it before something changes... like your view gets blocked by another passenger, or you arrive at your stop, etc.