Yes you can use Amazon pictures to illustrate your hubs, if you are writing a non specific sales hub then it is ok to still use Amazon pictures but as with all pictures you use on your hubpage articles make sure you attribute the picture back to the source.ie back to Amazon.
If you're writing a sales hub then yes it is also ok to use Amazon pictures, because hopefully you will sell something and you and Amazon will benefit from it. I always use text to describe the product in my own words, then place a large Amazon photo of the product at the side of your text, then directly under your text add the Amazon link to the product. Look at some of my bike hubs for an example. I will make a hub of this question to give more details, hope this helps.