True. We should just convert all Chaos forces to Night Lords. Save the devs time to be better spent on the magnificent helms of true excellence that is the helm of the Night Lord.
I didn't especially like the horns either. I've seen worse. I'd recommend spreading them apart a bit. I can't give you detailed reasoning for it, but I think it'd look better that way. I think that if they looked like they were there to gore someone, then they'd fit in perfectly. These look like they're too closed in to be used as an effective weapon. (Also ignoring the idea of goring someone being a terrible idea anyway, since you'd have to look at the ground to do it. It'd make for a neat execution though.)
I'll take a skull-faced helm, or maybe a nice ridge of spikes as a crest rather than horns - or wings. I'll leave the overblown ornamentation to the Emperor's Children or our preening loyalist brothers.