That isn't the commission however, that I believe is either from FW's Horus Heresy books or the new Chaos Space Marines Codex (which I don't own). http://images3.wikia.nocookie.net/__cb20120205224912/warhammer40k/images/1/18/Night_lords.jpg That is the actual commission. I can link you to the artist if wished.
Warp Talons are insane though, they're no better than chaos dreadnoughts. And I for one, wish for the crested helms to make an appearance. They are, after ceremonial. Hell, in that comission, Xarl is wearing his crested helm. (The artist took more leeway with his piece) Xarl did have a bat-winged helm in the novels though. They're part of the culture, just as much as lightning across the midnight blue, if that isn't in... it wouldn't feel the same.
Warp Talon's aren't insane as per Dreadnaught. Rather, going off the rules, they've turned into Daemons.