well the branches are a bit too geometrical and seam with the trunk strangely since they stick out at 90 degrees in these ones.
also note that a trees trunk doesn't ever extend to the top of itself, its only one big trunk at the bottom, and as the tree grows it splits up into more arms.
as others said, replace the white b/w leaves with alpha, and perhaps give each tree 10-15 "lone" leaves, which arent in packets, just to add some extra realism