Plagio Como diz no brasil :

I think now would be a good time for you to leave this site. This type of behaviour is absolutely not tolerated here.

Ouch, I got tricked again. Even though I knew something looked fishy.

Niels is right this is ripped and edited from fools scratch my back, would ya? www.pixeljoint.com/pixelart/44179.htm

wait.. isnt this ripped from fool's "could you scratch my back" or something?

see?:

http://imghost.nl/download/foolrip.PNG

I agree with everything said so far, except that I don't mind the cropped tree top.

I would add that the tree and mountain have their separate palettes with no exchange of colors. Not a good idea!

Keep working on it, it's worth it! ;)

I agree with r1k on everything -
I think the treetrunk is actually quite nice with the rough look, but it should definetely be lower saturation to match the mountain. At first I thought it was missing aa, but on second thought I think it could turn out pretty cool without any aa, if the design is perfected. IMO the darkest grass parts (the upper grass) on both sides of the tree should be removed. As I said the trunk looks quite good, but the treetop needs revision. And the tree should overall be lower saturated. The clouds look somewhat "childish", try to study some pictures of clouds, both real and drawn to get some inspiration. And last, like r1k also stated, the whole image should definetely be dragged a bit down, so the treetop isn't cropped!

On top of that, one tree does not a forest make.

the mountainy part is pretty interesting, but the part on top doesnt seem to match the same quality.  For instance, the color use in the mountain is interesting; yellowish highlights, reddish midtones, blueish shadows.  The tree has no hue shifting though, why not?  It looks comparitively quite dull and the shape of the tree could probibly use some work, why not make a WIP thread for this?  I think having the tree cropped off at the top isnt a good compositional choice, as I feel it gives the sense of the frame compressing down on the image.  Its a mountain top so I would think that it should have the feeling of opening upward, not closing downward.  Also, why is the mountain so desaturated, low contrast and lighter than the tree part on top?  It makes it look like two images pasted together.