For the Scott Spencer stinger head, I think you should make it a) your own texture b) better (if possible) than the one from the video/book. If you choose to keep it that is, personally I think you'll want to remove it because it's like the Eat3D pillar: people have seen it and know the tutorial, so it doesn't show much…
Put more padding on the description text, they overlay with the navigation bar, which isn't good at all. It should be easier to read for people! :) Should look at racer445's texture tutorial, this should help you a lot for improve the textures and make them "wow". http://www.nextgenhardsurface.com/index.php?pageid=racer445…