I second the pose and camera flash. I just got mine out and looked at him, the ass thing doesn't look nearly that bad on the actual figure. I think that is a very bad angle for a close up shot that makes it look worse than it really is.
As for the shadow thing, that's because the source of light is too bright, so of course the blue highlights look way too contrasted with the black. Either the person taking the picture had the flash on and took the show way the hell too close, or spidey is swinging under a halogen lamp. I will say the blue highlights aren't for everyone though. They do tend to show through with a flash.