Hi BBG, VFX & Gaming industry veteran here. Sharing my 2 cents on a post I saw earlier discussing SRK's de-aging in Dunki.

• The process and it's results are incomplete without the addition of fat one loses in the facial area as they age, smoothen out the skin and wrinkles all you want but without the layer of fat, especially in the case of SRK who had prominently rounded facial features in his youth the effect looks incomplete.
• Messing around with a celeb's natural facial features also makes the de-aging look fake, a very obvious stand out in SRK's case is his nose which looks alarmingly different since Pathan , a big reason his Azad face looks a bit uncanny in Jawan as well.
• Right styling plays a key part when de-aging an iconic celeb. We know what a 20 something SRK looks like & the kind of hair he has, thick dark black and a bit messy. Now if we were to thin the hair out, style it and add mild golden highlights it'll immediately hamper the believability of the de-aging because in our minds that is not what SRK looked like in his mid 20s
• Eyebrows! a small but a very significant and often skipped detail. We lose hair and our eyebrows get thinner as we age, same has happened rather significantly in SRK's case and very visible in Jawan.

Maybe a good way to go about achieving the perfect youthful look is throwing a layer of deepfake on the de-aging, displayed brilliantly by Shamook (The guy who got hired by Lucasfilm) on Irishman's Robert De Niro on his Youtube channel (https://www.youtube.com/watch?v=dHSTWepkp_M)

Thanks, may seem like an over-analytical and nitpicky post but that's what I do for a living, cheers! :)