PDCROAM

Hi there. I am trying to use a different image for my homepage photos on MOBILE versus the one I currently have and like for DESKTOP. The image I have works great for desktop, but as its more landscape, it doesnt work well for mobile - it crops it weirdly. I have a great image to use on mobile, but I want to understand how I can use a different image for mobile homepage/backgrounds than desktop. Thank you.