Hi ragul sp,
if the image is stored on local storage (on the device), the URL will likely have to be a "data:" url. Check here for an explanation of what these URLs are. You will build them by starting the URL with data:image/<format>;base64, and then appending the contents of the image (after converting the binary content to base64 you can find this functionality in the BinaryData platform extension).
If it's in a server database, you can define a screen that receives as input parameter the ID for the image, and in the Preparation fetches it from the database and ends in a Download tool. Your image's URL will be the URL for your screen plus the input parameter thats tells it which image to provide.