#1 A bit over exposed and quite some color noise visible. Due to the nature of the lens you used you have extremely shallow depth of field. I have a hard time determining where your focus point was. IMO this shot has to be rotated 90 degrees clockwise and level the fly. I think it will look a lot more pleasing.
#2 Nice colors, still some motion blur visible. Try a faster shutter speed next time.
#3 Over exposed, look at the legs and arms there you have patches of skin totally blown out. Could be a result of PP. The setting looks fine but the kids are not showing a special moment (well it's not like you tell them to give you a special moment). The boy probably just plays around with a bug on the bench and the girl watches. It's lacking a bit of concept there IMO. The way you worked the colors looks good.
#4 Ouch. Using cold color tones on images of kids is a tough game. That boy is way too lovable to be put into a Cyan image. First I'd have said the WB is way off but obviously you added the Cyan. Check his hair and some parts of the grass, you blew out some of the colors because of the Cyan tinting. I don't think this worked out too well. The picture itself is captured nicely. Focus appears to be in front of the boy and not on the boy.
#5 drop it. Nothing to see here except some generic tiny yellow flower.
#6 GREAT! Near perfect. Very nice image to hang on the wall! Well done!