This is the cover for the first eBook in a Fantasy trilogy.
The design is centered in a particular moment, when the mighty warships of the Syriot Empire attack the distant shores of the Three Kingdoms.
The illustration shows the ferocious pirate Captain Black Bekhar with his feared axe, that fights along side with the invaders, against the troops of the Three Kingdoms (that we see on the cover).
This is a Fantasy series, potentially marked as YA but that also has a lot of violent action and adventure.