mritchy i actually did shoot a few like that, i was having a hard time getting a good exposure on the faces, this one imo turned out better so i put it up.
#2 is a little out of focus, the focus fell largely on the floor and the train, but still soft. i thought it gave it fun touch.
as far as the vignette it can get a little overwhelming, these are a few of the versions i edited for them, so they still have the original photo with the natural vignette before i toyed with it in curves.
it was my first time using a speedlite, and i had only had the full frame for about a week, it was a good mess to throw myself into, sink or swim mentality i suppose.