Where in here would you like to add an image?
Green section
There’s a after-login-buttons plugin outlet at the bottom of this section that can be used for adding content. I suppose it can be moved to the top with CSS, or an outlet above can be asked.
You can create a new theme component that makes use of it.
You can also probably add an image only with CSS in a less clean way.
Could you post a picture of what you’d like your login modal to look like?
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Yep,
I was thinking of ::after or background-image with CSS. Didn’t know there were plugin outlets there. I think it’s overkill to write a full TC just to put an image there?
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I’d say it cleaner and more versatile to make a theme component using the plugin outlet, plus you’ll learn useful things if you want to customize further your installation. 
Using a pseudo element from existing HTML to add your image will work and it’s a valid way to achieve this. 
That said, it depends on what result you want exactly.
For example, if the goal is simply to have a background image at the bottom or top of the login buttons block with no additional requirements, then CSS could be perfectly fine.
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