Book cover in high quality

I need a book cover photoshoped and edited in a quality way. A sample is attached to the post, I made it with my basic knowledge. The concept is that, I need grammar correction (screwed up Battalion, wrote 2 Ls no Ts) and more up-to-date pictures of war and a mushroom cloud in the Y, a filtering.
I'm happy to work with new fishes, just need a guy who is enthusiastic.
Thank you,
Joe