Book cover, "Zariel's Doom" by Joseph Robert Lewis.
The book isn't out yet so the title may change until publishing.
I personally recommend this series, very entertaining read with an interesting magic system, a dash of gritty realism just where it's needed and some surprising plot twists.
Autor's site: www.josephrobertlewis.com/
my facebook: www.facebook.com/LauraSavaArt/
From the same series: