Image widget in Mobile:
https://success.outsystems.com/Documentation/10/Reference/Mobile_Interfaces/Designing_Screens/Image
So, there is a widget called Image in Mobile, that you can use. It's almost the same thing as in the web. One of the differences is that if you want to show an image that is stored in database (binary), instead of defining the entoty and Id, you just pass the binary (the content, that you can get from the database).
Cheers,
Eduardo Jauch