While teeth gritting vs open would be the best alternate Maul look, at least the new open teeth head looks good and feels fitting more Maul, it has a snarling look to it, where the original looks more like "ow I stubbed my toe!"
That style of open mouth gesture is very hard to get right in figure form it seems, this new Maul is the first time I've seen a head with an expression of that type where I liked it. The HT X-Men 3 Wolverine looked bad, the HT Hulk looks bad, v1 Maul, etc.
The new neutral head does a great job of capturing the eye intensity of the Sideshow v2 with a very accurate sculpt.