That's interesting! We talked this to death last time around, but if they had gone with a design like that, they would have had to use actuators etc. rather than using Chiklis' expressions, so the film-makers chose, rightly or wrongly, to go with the design they did.
In this case, we don't have those limitations.
I also remember Tim Story using the old standby "it would be too 'cartoony' " to rationalize their decision to not include a brow.
The crazy thing is every time Fox makes a Superhero film, they seem to be obsessed with the idea of it not being too 'cartoony' . . . but I have never seen anybody fault a film like this for being too cartoony. We've got a talking raccoon in GOTG, but I've yet to hear anyone say they're not seeing it because of that. On the contrary, that seems to be one of the big draws.