Start Strong and End Strong
Even having picked the best images ever, there may still be a slight hierarchy of greatness.
Make sure to start your portfolio with one of your best or most impactful images and end with one of your strongest images as well.
An amazing first impression will keep people browsing on your site and will leave them with a lasting memory of how they first felt when they saw your work. Closing out with a money shot is going to reinforce that strong impression to make sure your greatness is what sticks out in a viewer's memory. Science!