A Tree in need.

[touch_me]

Hi guys, me once more. I'm working on a tree for my friends server and i seem to have fallen into a rut... per say...I am still very much so a novice pixel artist so i am having problems shading this tree that we made. I know many of you are much better then myself so i would like to request a bit of assistance.
If anyone can even come up with a good color pallet it would be of great help.

-Thanks, Puggy.