The main thing is that images must be where you tell Twine they are.
The easiest way is to download a copy of Twine to your desktop, and run it locally. Then keep the images in the folder you reference.
I'm not familiar with the Harlowe syntax, but in SugarCube for example it's this:
[img[images/map.jpg]]
Here, "images" is the subfolder in the folder where you have the Twine run file.
This won't add the images into your passages blueprint construction view, if that is what you were asking, but I think that's a bad idea all round due to the performance issues it has. I don't want it to be trying to load up 50mb of images whenever I open the editor.
If you just want to reference external images from another website, then you do that in much the same way as embedding any image into a website. Even YouTube embed code works in Twine.
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The easiest way is to download a copy of Twine to your desktop, and run it locally. Then keep the images in the folder you reference.
I'm not familiar with the Harlowe syntax, but in SugarCube for example it's this: Here, "images" is the subfolder in the folder where you have the Twine run file.
This won't add the images into your passages blueprint construction view, if that is what you were asking, but I think that's a bad idea all round due to the performance issues it has. I don't want it to be trying to load up 50mb of images whenever I open the editor.
If you just want to reference external images from another website, then you do that in much the same way as embedding any image into a website. Even YouTube embed code works in Twine.