While the quality of the image is certainly top notch, I agree with a lot of the folks on here. It's not evocative in the least! If I was the art director they would have gone back to the drawing board. In an era where table-top RPGs are a dime a dozen your product better jump off the shelf otherwise it's just another game that people will pass by. Now, take Larry Elmore's iconic cover for Star Frontiers...nuff said, I wanna play that game.
I'll chime in on another point people have raised. 582 pages? Seriously? Break the darn thing into a rules-only book and a PHB. For those that prefer a print book to PDF, who wants to lug that thing around. It's absurd!