Slider block which is recently released in the Moodle plugins database provides you the ability to add a simple image slideshow block, with easy setup and configuration.
You can add up to 10 photos as slides, and configure parameters like fade or slide effect, slides interval, disable navigation or pagination, add header text or effect.
Slider is responsive, but You have to set up width and height in configuration to achieve correct display for your photos/images. The Slider block uses SlidesJS jQuery based slider.
You can download the Slider block from this link: https://moodle.org/plugins/view/block_slider