very nice use of color

 I have to say i agree with someone previous here that I think it might have been better to leave that creature out if there was no time to finish but since it was the point of the challenge I can see why you left it in. I think it's good to be ambitious but sometimes you need to consider bringing things in just a little maybe.

smaller canvas.

I don't know what this is but it's really cool!

Great work!

 The background is awesome! but... the birdman looks unfinished? 

 the lightsourse is not wrong, I explain later with math ( not on his right hand tough...)

 You have a weird http://www.pixeljoint.com/pixelart/52861.htm vibe going on here. Intresting.

I am extremely confused by the light source. According to the man's head its coming from the top-right. According to his chest its coming from strait ahead. According to his right arm its, idk, but off. 
The scenery, especually the grass, is fantastic. Shame that things are rather messy on the character and in between the close mountain and the far mountain. 

 You're certainly one of the most ambitious pixel artists here.  The scenery in this piece is absolutely gorgeous but the character is pathetic.  I really wish the bird man wasn't in this piece, it would be so much stronger.

Aposto que ficaria ótimo se você tivesse tempo de terminar.

I love colors,shading style and perspective but somehow this piece feels like it is still wip..

 This is pretty dirty, but the concept is nice. You should work on smaller canvases. 

Awesome :)