I created a test journal entry for your images here: https://www.inaturalist.org/journal/twainwright/59397-photo-test-for-ram.
Both google and imgur links work for me (in Firefox). Here’s the relevant code:
From imgur:
<img src="https://i.imgur.com/eB8PXaz.jpeg" alt="Test image" width="240" height="180">
From google:
<img src="https://lh3.googleusercontent.com/pw/AM-JKLVH9ml5i_upr5qsFt0dx_aivBOSHYgwFyAH_0N7BaP0uaMe3VN49pnaQU5I58TpX3tN32YE3y3pnhiBwHWeslJLBlhm4fy6XSzo0XmyfOxIPrmDf-soLiWAiYa6y7-gJwu4yXvRmb533XhJqE57j8Y=w842-h596-no" alt="Test image" width="240" height="180">
Be sure to link to the actual image file, not the google or imgur photo display page. To get to the image file from the display page, right click on the image and copy the image link.