These photos look more like snapshots to me. Perhaps you could either use a longer lens or shallower depth of field? Looks like the pop up flash on camera was used as well. The fill light is overly harsh and overdone. Shadows are too harsh as well.
In photo #5, make sure your subjects aren't posed for an 'upskirt' shot. Putting her more of a side angle would emphasize her pregnancy (a good thing) and minimize the knees pointing at the camera. Also in #4 and #5, try not to cut your subjects off at the feet. Either include all of them or crop them tighter as you did in some of the others. Never cut off hands, fingers, feet or toes, or even ankles and wrists.
Next time, perhaps you could take them at a later time of day? Then your ambient light would be much softer and if you diffuse your flash, overall effect would be much more pleasing, I think. 