Are you married to the 100% forest spirit theme? If so, I dunno what to suggest, treeman is a waste in 1k and treekin are often a liability as well. Taking another unit of dryads seems so boring ...
All the same I think you have one too many branchwraiths. If you want to expand into the rest of the book, drop the lamentation one and spend the points on either an alter w/ HoDA, or look into another unit of anything. Friend of mine runs 4x 10 dryads and a unit of 10 dancers (w/ noble), have yet to beat the army despite him having played a grand total of 6 games.
I'm unsure of the points but I think some glade riders to bait-and-switch (which all those ItP dryads can't do) and an eagle to irritate / hunt war machines would be good tactical investments. Or some wild riders should fit in your theme and provide some reach too.