Hmmm, unfortunately, not good news.
#3 is probably the best of the batch. The others have too many issues IMHO.
I cannot tell where you had the flash in these shots? On camera, I am assuming?
#1: Hair is blown out, exposure looks off. I think the sunlight was too intense in this particular shot. Do you see the shadowed part of the tree trunk? It is properly exposed, but everything else looks off.
#2: Face is underexposed, eyes are dark.
#3: Strongest of the series. Not bad. Could use some basic post to make it pop a little more, like curves adjustments, etc.
#4: Light is too dappled and faces are dark.
Hope this helps.