I tried Avatar IV last month for a fake documentary style channel and honestly the newer facial movement system is much more believable than the older static avatar generation. The biggest improvement is emotional timing. When your voice rises in excitement, the eyebrows and cheeks react naturally instead of only moving the lips. According to HeyGen, Avatar IV analyzes tone and rhythm instead of simple mouth shapes only.

Yeah, emotional delivery matters more now. If you feed flat narration into a premium avatar, it still looks fake. I started recording my own rough voice first, then cloning it later with AI. The timing becomes much more human.


Lighting inside the source image matters too. I uploaded a dark selfie once and the mouth area became blurry during speech. Bright front-facing images produce cleaner face tracking.

I’ve been combining HeyGen with CapCut for micro facial edits. Sometimes adding tiny zoom movements in post-production hides minor sync imperfections.

The multilingual support is crazy now. I translated one English video into Hindi and Spanish and the mouth movement actually adapted to the language sounds instead of keeping English lip patterns. That was impossible a few years ago.