C&C per req:
1. The mian issue I see is the crop of the arms at the bottom. Longitudinal crops are something that should be avoided at all costs. I think too, a bit of fill from camera left, 30-40 degrees might not have gone amiss.
2. The light isn't what I would call exciting, but I think for an image of this nature, it's appropriate. The gentleman in the red shirt is leaning a bit, but other than that, pretty good.
3. Nicely composed; I like the arrangement here, but your key light seems a bit hot, and judging by the shadow on the chair, your light was either too far away or insufficiently diffused. The image also seems to have a slight lean down to the right.
4. Nicely done and well lit. My only nits here are the arms being cropped longitudinally and the lady in the green shirt. Her hair needed straightening and she's pushing her face into the shoulder of the lady next too her; when doing this sort of pose, tell the subjects to just touch the shoulder, but NOT rest or press on it. THe lady with the blonde hair could stand to have her head turned just a little less, you've created some unflattering neck wrinkles.
For a first go, I'd say you've done very well. There are only a few very minor issues, and probably only things that another photographer would notice.
Just my $00.02 worth - your mileage may vary.
~John