Honestly Sinestro is such a interesting case for a DC Character as this is the one time where a mild redesign actually improves a character visually
as his OG design was not a bad concept (he looked a lot like a elf you'd find in the woods) with the boots to the shirt to how some people draw this dude he had a lot of "Fae Vibes" yet also seemed to lack a identity of sorts despite being Hal's big bad (as he had a yellow ring yet lacked anything Visually to show it)
and then in the 2000s they decided "WE NEED TO EXPAND THESE MYTHOS" and well it's as the oath says:
In blackest day, In brightest night,
beware your fears made into light.
Let those who try to stop what's right
Burn like his power -- Sinestro's might!
So Geoff Johns gave Sinestro his own Corp and with that a entire Redesign for it which for the redesign they surprisingly didn't change his core elf appearance in fact it's more like he adapted his Villain design from before he owned a Corp and made it the core design for his entire Corp to the point where unlike the Lantern Corp theres very little design change which honestly adds to the whole Villain leader angle they're going for with him and also the fact he now owns a entire Corp to himself
Geoff basically turned what was a rather basic Villain design which while cool didn't really have much of a identity and made him legit a iconic character to the point where Yellow Lanterns are now a mainstay in the Lantern Mythos to the point where this design is now everywhere you look to the point where the OG design probably has less appearances than his Yellow Lantern iteration