I'd suggest adding in some rocks and plant variation. Have you ever seen a forrest with just large fat trees? Try adding in some dirt and varying the tiles a little. Also, if your going to use the lightning (personally I dont see anything wrong with it) I would suggest adding in a light blue or white fog to mask it a little so it isnt so sharp looking. Blizzard lightning does kinda suck, but there are ways to make it look better. Another thing, change the blizzard lightning maximum roll to .1 or some other number. That way it wont be perfectly verticle. I mean, how often do you see perfectly verticle lightning? Anyway, not your fault. I blame blizzard.