I have Dynamics 365 V9.0.9.4 On-Premise, and if viewing any record in Unified Interface the Entity Image does not display, it shows a small icon.
To give more details, I created a contact and uploaded an image, it shows perfectly fine in the classic client, while in the Unified Interface it dislays a small broken image icon.
I think it's a bug from Microsoft, please let me know if it was solved in later Updates.