I liked the other version that you showed me yesterday better ZuqR sorry, could be that I´m not a big fan of these kind of covers.
However I agree with skally here, the coloured objects that you added to the cover should be used to really make the cover come alive and maybe add something in them like some graphics etc. Also one thing that I really dont like is the cutout from the border for the title placement, think that a added layer of title on top of the metal texture would add to the 3d effect more than this cutout version.
The poster is also really misplaced, atleast that´s how I felt, it should have been more to the right so the whole face of Optimus is showing and maybe clone the left side so it continues out all the way to the spine if you get missing spot´s.
But hey, that´s just my 2 cent
If all fails, try again!