How can i use custom images on my plugin?

Im developing a plugin integrating an external API.
As a response to the API calls i want to print some images into DOM.

My question is:
How can I serve custom images with my plugin into storefront?
I have extended a file and inside of a block im trying to use:
 

That generates the URL “/public/test.jpg”
 

Which directory should i place my image on and how to call it properly in Twig template?
Thanks.

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