Rick Riordan!

 Rick Riordan has done it again! He knocked me for six yesterday when he announced Percy Jackson's Greek Heroes which is kind of a follow up to Percy Jackson's Greek Gods which was released earlier this year. Both (as with all of Riordan's novels) are illustrated by the fabulous John Rocco.

The Blood of Olympus UK cover! XD

How amazing is this cover! This time around I think that it is the UK cover that is the best cover. No offence John Rocco I love your work but this one trumps yours.

Alison Impey

Alison Impey is best known as the cover artist for the Daughter of Smoke & Bone trilogy by Laini Taylor.

City Of Heavenly Fire

Above is the cover for City of Heavenly Fire which is the sixth and FINAL instalment in the Mortal Instruments series. This like it's prequels the cover of City of Heavenly Fire is designed by Cliff Nielsen.

Jim Di Bartolo

Jim Di Bartolo is an American illustrator and author. Above is a book he illustrated which his wife Laini Taylor wrote.

Divergent trilogy

 Above are the US covers for the Divergent trilogy. The artist is a man named Joel Tippie.

Tim O'Brien

Tim O'Brien is best known as the illustrator for The Hunger Games trilogy. Although he describes himself as a traditional painter he created these covers digitally.