The Dropbox link is broken.
I believe a plugin image should be free of charge, but in case of doubt, you can get more information from the plugin details as plugins differ with their use of assets (e.g images).
I hope this helps!
I have seen plugin page on WordPress directory but no details or guideline on use of Image. Please see the below link of image the way i have used in my post.
What if i give Image credit at bottom of the image. please see the below image.
As WordPress is opensource so images will be free to use. What i think. Is there any guideline from the end of WordPress.org. If i give images credit is it enough not to violate any law.
Thank you for the screenshots!
To my knowledge, you are promoting a WordPress plugin that can be accessed in the WordPress plugin repository and not violating any laws.
In the second screenshot, you can add the full link to that plugin and not just wordpress.org.
Nice work on your plugin review! 🥂