We already had that, didn't we? At least, Liara's helmet generally extends a little further back.
That's the only time I've ever seen it look even vaguely noticeable, and it's in a still shot of way better quality than is achievable "out of the box". I'm assuming enhanced visuals?
Seeing as that's pretty much the last time in the entire series in which we'll ever see her in a helmet, I'm not sure it is enough, at any rate. I never noticed her helmet protruding in ME, but I could've missed it. Then, ME2-3 brought us those wonderfully ridiculous breath-masks to replace helmets.
I'd like the Asari to have clearly designed helmets in MEA. Even if it's as subtle as the above, I'll now be on the lookout.

They eliminated helmets, for some reason, in ME2-3, and ME was understandably not working with the same type of budget. (Again, it may have had extended helmets for Liara, I guess. If it did, I've sure as heck never noticed, in approximately 4 dozen completed playthroughs.)