Instead of implementing a complicated solution to show images in the List view or Form, you can use emojis if you just want simple images for indicators or color coding records.
Below I’m adding some refresher for Opportunity list view and form
The emoticons are actually characters so you can use them anywhere you see fit for text or labels. In my case, I opened the Rating field of Opportunity entity and update the optionset labels with emojis:
In Windows 10, you just need to click to the label textbox to edit and press “Windows + . (dot)” key to open the emoji input panel:
If you think it would effect on your filter or query, you can create a new separated field for the icon.
That’s it! Have fun!
Dynamics CRM Experience 