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I agree with Dannyrod about the time of day if at all possible (and sometimes it is not). Also I agree with Dannyrod that throwing the background more out of focus in a few of the shots may have given more pleasing results. I also think that the subject with the most pleasing body shape (usually the female) should be placed in front. Instead you featured the guy's figure in #29, #28, #1, #39, #38, and #37 which I think most people would agree, male and female, is less pleasing than the female in these shots.
I do appreciate all of the playfulness in these shots and the taking on of the challenge of shooting in harsher and contrastier lighting. You get an A+ on that account!