For this weeks challenge. :)
[EDIT] I've added a dithered graidient to the sky, skulls and bones at the base of the tree, mist below the tree line and a few spiked poles in the field. :)
[EDIT] The dithered graidient of the sky has been removed and I've improved the tree line. :)
[EDIT] I've tweaked the tree texture a little and added a few more twigs to the branches.
Heres how it looked like before the edits i.imgur.com/2o7Rd.png