Originally Posted by
DanK
I'm not very good at this type of photography, but in my mind, it is as much a matter of the quality of light as the amount of light. One reason that I routinely use flash indoors is that the available light is usually not very good, e.g., leaving eyes shadowed, providing no catch light, etc. Your second shot has some strong horizontal light that brings out detail, not just on the person in the foreground, but also some of the others, e.g, the face farthest to the left. In contrast, the available light in the first one is bad, it seems to me, providing some detail on the clothing but leaving the faces almost entirely shadowed.
My simple approach to candids in lousy lighting will strike some people as primitive, but it works pretty well indoors. I use a bounced flash, often with a diffuser, and a large bounce card (standard Demb Flip-It). Demb says to use the card mounted on the short edge of the flash so that you can bend it 90 degrees for portrait mode, but I sometimes mount it on the long edge to allow me to alter where the bounced flash goes. If you do that and want to be able to turn it for portrait mode, you need to add a bracket, which I occasionally use.
Outdoors is tougher: usually no surface on which to bounce. I don't usually end up doing outside candids in low light. I think you might be able to do semi-direct, that is, aim the flash at an angle, but I'll leave this one to someone who does more of it.