Am I missing the "How-To" on Forest Battlemaps?

[xrast3u]

Well I am playing around with the trunks in PS, trying to make something that looks cool. I am not sure if I am the man for the job, but once I get something that I like, I will share it with you all and provide my tut as to how I arrived at my result. It is ok if you are all a little scared of what I am going to come up with. I know I am. : ( lol

EDIT: Great suggestions everyone. Here is a revamp with a little more shadow. What do you all think? What is is missing?

I wanted to post the PNG file, but it was displaying it wrong. In my earlier days I remember there was a way to fix that, but it excapes me at the moment. Anyway, once finished, I can post the PSD and PNG file. A tutorial as well. I want to make a few different shapes for a little variety and then we can use these for the trees in the battle maps or whatever.