It has some shading issues, but it's still a nice piece. :)

 ya, thats why some times I join chalanges so I can get more exp on it

 I see... If that's the case, then maybe some shadowing practice is in order :3

I'm sorry, I tryed but I can't do any better D=

see? >>> http://imgur.com/WaFkSka   

 You seem to have pillow shaded the sheeps fur, could you by any chance fix that? If the light is coming from the front, then the wolf's head would be blocking the back half of the sheep, casting a shadow over it.

Also, the sheep's face isn't really readable, and the heart is strangly shaded.

 Ótimo.

 I like this concept. =D

 Thank you 

 Soo .. Beautiful