C&C per req:
1. Nice shot, good expression. A touch hot on the exposure though. I think this oculd have been dialed back about 1/3 stop and the WB seems a little too warm to me.
2. Some odd colour casts going on here. I'm also not fond of hte partly cropped people. I think this would have been a LOT stronger with one or two less people, and no cropped torsos.
3. I like the idea here, but I think it would have been even more effective had the book been held higher and the faces completely blocked. Your monochrome conversion is a little too mid-tone rich, and would benefit from a slight contrast boost. What is the black spot image left?
4. Nicely captured; again a slightly over-exposed, and maybe the red channel could be dialed back just a hair as well. Watch your backgrounds; the picture frame and furniture are adding a number of distracting elements that compete for the eye's attention.
5. I think this one needs to be leveled, and the crop on the RH side seems a bit awkward.
Overall, they're not bad at all. A few minor areas where they could be improved. Keep shooting, keep posting.
Just my $00.02 worth - your mileage may vary.
~John