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I used an amazon picture as the thumbnail for my Scooby Doo wizzle.(http://wizzley.com/scooby-doo-bedroom/). On the page I advertise the product, with the link. Is that enough to make it proper to use the picture for the thumbnail? I am scared to death of the copyright police! 

I think it's ok. But---as we say in a restaurant kitchen---when in doubt, throw it out.

Instead of being "scared to death", simply use a public domain pic from pixabay.com or find something on flickr creative commons, e.g. a dog, a bed, etc.

I've done this a few times too. I hope that by linking back to the site where the product is for sale we are okay.

Amazon pictures are provided by the manufacturer of the product, so as long as you are linking back to the product itself for sale, you are good.  However, you should not use the picture in any other capacity unless you get permission from the manufacturer (which you won't in most cases.)

OK, I will leave it there since the page DOES promote the product. It wouldn't be the same with anything else, that's the problem when dealing with famous people!

More than being scared, I am not so sure with copyright issues. I believe in people having the right to copyrigh, and don't like the massive abuse on many sites.

Manufacturers provide pictures of their products for distributors, etc to use because they want to show their products in the best light.  Therefore you are using the picture as it is intended.  This is different than stealing copyrighted photos or artwork from another publication or site.