Above is an Image Gallery with the minimum requirement of two portfolio worthy photographs.
This example Image Gallery Settings for Type is ‘Tiled Mosaic’ which displays in a thumbnail kind of view until you click on the photographs then enlarged view of images appear in a slide show view. Set Gallery Settings to desired preference.
Vimeo URL: How to Set Up an Image Gallery
Here is a tutorial that shows a step by step process for creating an Image Gallery.
How to Set Up an Image Gallery from Abby Greenlee on Vimeo.