http://i1232.photobucket.com/albums/ff368/philippejugnet/mistakesfixed.png

for you

 Lindão Ric, amei as cores. Essas nuvens me enlouqueceram! :P

The picture doesn't really convey an impression of sound. 

Sky palette is nice. 

 what do the letters mean? A, F, A, T... those small platforms all have letters on them.

XD I believe the ninga is hitting himself

 I'm not feeling the noise. What exactly is noisy about it?

Yes, the trunk looks odd. And I think the edge of the foliage is too dark compared the the rest.

is this for the weekly challenge? the house looks flat for me and the light used on the tree is wrong. Clouds are stylistic but I dont believe its a perfect fit here.

edit:

tree's trunk is in wrong position maybe. I don't know about that

 Tree is cool!