These photos were shot with a macro lens so that is probably why they look bigger. they can fit in the palm of your hand.
They are all ball pythons of average size for hatchlings. They are all different morphs, for the most part. The silvery one is a pewter, there is also a pastel, spider, and a cinnamon in there amongst some normals.
Eventually you will learn about the crazy amounts of genetic color/pattern morphs that ball pythons have. It is really awesome to mess around with.