Thank you all for the feedback, I think I'm not going to work on this piece anymore, but I agree with all the criticism.
se fosse eu ai preciaria mais do que uma simples nozes pra tampa tudo heeueh . Ficou bom,pena q n terminou a tempo 
This piece actually becomes a joke in swedish as the word for ''acorn'' can also mean the glans of a penis.
He should get rid of the acorn since the piece is no longer limited to the challenge's rules xD
The piece looks awesome overall, though I agree with DB. The mountain in the BG could be less saturated (our eye desaturates the colors when the light comes from a far point).
You got nice colors and technique. The composition is a bit off ("Rule of thirds" is always worth consulting) and the green tower in the background is competing for the attention. Still, fresh stuff. :)
Awww, shame you didn't get to finish this in time. It's really well executed, and as cure said - the acorn is a neat use.
The tree roots kind of blend in with te stone, I had to zoom in to work out what was going on there.
Shoulders are too narrow I think. Good clean pixelling here (no pun intended). Would've been a great entry for the challenge, I like that the censorship acorn resembles the anatomy it's covering.
And that's a shame you did not finish it in time, because it's a really cool picture!
@Elk - you always make me laugh so hard AHAHHAHAHAHAHHAHA
@helio - *wishpers* DO IT FOR ELKY PLS!