Lightbox Gallery
Similar to the Lightbox module, this module offers an accessible lightbox for images (using Modaal). This module allows you to open a gallery of images with arrow navigation.
Lightbox Gallery Settings
General Tab
In the General tab of the module, there is a Gallery field to upload your images. Be sure to add alt-text to each image!
Style Tab
In the Layout Grid field, you can set the number of images displayed in a row at different responsive sizes for the page. By default, 4 images will display in a row on larger screens, 2 images on medium screens, and 1 image on small screens.
Advanced Tab
In the Advanced tab of the module, there are all the usual settings for margins, visibility, and advanced HTML settings.