When an organ is hit, the organ should briefly strobe flash for a small amount of frames (like in the image) and play a sound so you get better feedback on where you hit. This would be a client-side effect so it would consistently flash the same duration (less than half a second).
I know this is likely a controversial suggestion because it would make the game more "arcadey," so if the game is meant to be more focused on realism then I'll understand; however, I do believe this would make hits feel more responsive and impactful if you slashed and saw a bunch of organs flash and had an audible cue.
This would fall under game feel / responsiveness.