Looks good, perfect choice for the picture shown.
I mostly use 'group' since it fast and so far smart enough.
Even though I'm not sure exactly what criteria it uses...
I use Group AF a lot too and it took me a while to figure out how it works exactly.
What I like about Group AF: It uses all five-focus-points simultaneously to achieve focus lock (sweet!), it automatically employs a degree of focus-tracking (sweet!) and, when in AF-S mode, Group AF also employs facial-recognition and attempts to focus on the eye of the nearest person (sweet!). In my experience no other focus-mode snaps to and maintains a solid focus-lock like Group AF. In low light situations where other modes struggle, or fail entirely, Group AF will grab and cement a focus-lock without hesitation.
To better explain how it does what it does, think of the whole
group of five focus-points you see in the viewfinder as
one, humongous focus-point. I say that because Group AF will always attempt to focus on the
nearest bit within the group of focus-points without giving preference to any
particular focus-point (because it's acting like a really big single point). That's a subtle, but important, difference.
With Group AF the criteria for
where to lock focus is, "What's closest?" Closest Bit = Bit Most in Focus.