Why is that big rectangle on the top of the body of the gun? I'm assuming you did one of 2 things.
1. You Google image'd "AK47" and took the first picture you saw, but it's pretty pointless to make that rail on there if there's nothing attached to it.
2. You don't quite know what an AK looks like, but you can get a basic figure in your head so you dove into the project without any research.
Judging by the shape of the stock (upside down?), the long, narrow body, and some other proportional errors, I'm going to say you didn't do your homework. Next time you should study more and try to get the right shape.