Hello @dogiko
I just found that you want to show another image for mobile instead of the image for desktop, am i right ?
If yes, then you need to add the option in customization to select the second image which is used for mobile.
To add the option for image, you need to take help of expert or experienced developer who can do it.
If you want me to do this, then i can help you.
Kindly DM if you want to make it.
Thanks !!