Hello Priyanka,
You need to create an entity within your model that inherits from image.
Create a page where you can upload an create your images
Then you need to create a page with a list view where you show all of your image objects of the entity.
Implement on this page a dynamic image viewer
Upload your images and save them an watch the result after adding them
please also read the below info from mendix:
https://docs.mendix.com/refguide/image-viewer/