Whilst I like the idea of the silhouette wreathed in fire, I don't think the fire you have drawn works well in this case. I would perhaps consider getting some stock images of fire, or looking up some Photoshop tutorials to give you an idea about how to generate better effects. Also, you have used two fancy fonts, which violates what seems to be an unwritten rule about covers I've noticed. If you use a fancy font on your cover, that's fine, but if you use other fonts in addition to this, those fonts must be very plain, i.e. sans serif and not italic. Two non-fancy fonts can also be fine. The colours used on the fonts look muddy and don't grab my attention.
The back cover copy might be better centred or justified, and it seems to be in Arial, and no-one likes Arial. :-( I think it also reads melodramatic and overwritten and is far too long. It leaves out what I would consider to be important information, such as why Andreas killed his father and how he feels about that (which makes him sound like an unsympathetic character), what a Fire King actually is, and how the king could make a decision whether or not to execute his son when he was dead. Writing pitches about their own stories is something a lot of people have trouble with, and it takes practice. Making random guesses, I think you want to go for something more like this:
Prince Andreas, a boy of eleven, killed his father the Fire King under the influence of a psychotic drug that was slipped into his porridge by the malevolent Water Queen. The Fire King's ghost appeared at Andreas's hearing and asked the jury to pardon his son and spare him the executioner's blade. In view of his father's wishes, Andreas was exiled from the palace and stripped of his title.
Eight years later, Andreas meets an old woman on the street. Offering to be his mentor, she explains to Andreas that if he can master the elements of fire, earth, water, and air, he can become Fire King and reclaim the birthright he thought he'd lost. If he can do this, he can then avenge his father's death. But before he can become Fire King, Andreas must overcome the shadows of his past and his fears of the future, deal with the love of a friend and the hatred of an enemy, and conquer the elements around him and the feelings within him.
It's not great, but it's punchier and more compact. Experiment and see what you can do.