Yes, I recently made an update to allow quick alternative portraits when events happen, such as casting spells, reveicing damage, affected by states etc.
Since this update is still quite new, I haven't added it to this itch.io site yet.

I haven't purchased the plugin yet, but if I buy it and you update it later, do I have toalso pay for the update? Also, do you think it would be compatble with other plugins that adds animations to the front battle actors? Bc I wanted to make them fully animatedut as I see, your plugin cannot do that right now
No, you don't have to pay for future updates.
That's difficult to say, as there's no default "actor portrait" interface in the RPG Maker's core code that we plugin devs could use, so every plugin devs make their own implementation of actor portraits. You can tell my plugin not to show portraits, so the other plugin can render hero animations; however, when having multiple plugins to customize the UI elements always has a risk of incompatibilities.
You can tell me the name of the other plugin and where to get it; and if you notice compatibility issues and I can try to fix them, and if I fail I can also offer a refund.