Thank you for your question!
The best way to manage you content across different screen size is to use the responsive tools available in the Visual Editor.
Switching between the 3 different views (Desktop, Tablet, and Mobile) will give you an idea of what your page content will look like on those devices and allow you to make the necessary adjustments to their display.
I hope this helps you get your images working as expected on multiple devices and please let us know if there is anything else that we can do to assist you.