The end of the "picture" competition

The question was - what's wrong with the picture made by my son :-) Dominik from class 0a
The drawing presents the battle of five armies from "The Hobbit".
The correct answer is - there wasn't any dragon; when the battle took place he was already dead, killed by Bard. 
There were three students who know the book and could send me the correct answers. These students are:

Congratulations!!!