I read the first novels in each of these series recently and loved them! I get a lot of requests for recommendations of books that fans of such series as Artemis Fowl, Percy Jackson and the Olympians, and The Ranger's Apprentice might like, and I think both of these series really fit that particular bill...
The Lost Journals of Ven Polypheme, Book 1: The Floating Island, by Elizabeth Haydon
Charles Magnus Ven Polypheme—known as Ven—is the youngest son of a long line of famous shipwrights. He dreams not of building ships, but of sailing them to far-off lands where magic thrives. Ven gets his chance when he is chosen to direct the Inspection of his family’s latest ship—and sets sail on the journey of a lifetime.
Attacked by fire pirates, lost at sea and near death, Ven is rescued by a passing ship on its way to the Island of Serendair. Thankful to be alive, little does Ven know that the pirate attack—and his subsequent rescue—may not have been an accident. Shadowy figures are hunting for the famed Floating Island, the only source of the mystical Water of Life. They think Ven can lead them to this treasure and will stop at nothing to get it—even murder….
Monster Blood Tattoo, Book 1: Foundling, by D.M. Cornish
Set in the world of the Half-Continent-a land of tri-corner hats and flintlock pistols-the Monster Blood Tattoo trilogy is a world of predatory monsters, chemical potions and surgically altered people. Foundling begins the journey of Rossamund, a boy with a girl's name, who is just about to begin a dangerous life in the service of the Emperor. What starts as a simple journey is threatened by encounters with monsters-and people, who may be worse. Learning who to trust and who to fear is neither easy nor without its perils, and Rossamund must choose his path carefully.
Complete with appendices, maps, illustrations, and a glossary, Monster Blood Tattoo grabs readers from the first sentence and immerses them in an entirely original fantasy world with its own language and lore.