Nice elements, but the image is too annoyingly yellow, giving it a comic book feel - did you not like it in white, or was you white balance off? Consider adjusting it in Photoshop.
Nice set up with great light and colour saturation. A couple of points though: The image appears slightly grainy/noisy, and; I think resize may have played havoc with edges of the gun as some areas seem rather jagged.
I love your chess pieces by the way :) Good luck with the challenge! bump