It's very interesting to see the muscle sculpt on its own, and to think about the creative choices they made. It's pretty much 99% anatomically realistic, which was a direction they certainly didn't have to go in. It could definitely have been more stylised.
And the bulk - it really must be adding a LOT of volume to Ben's body - they definitely could have had a much slimmer Batman if Snyder had wanted it, and I would maybe like to see that in the solo movie (maybe in flashback?).
Also the texture of the fabric - it's just 3D printed so it could have been ANYTHING. The faux fabric weave definitely looks cool, but it could easily have been a leathery or skin-like texture, or stone-like, or what have you.
While I love the suit, it would definitely be fun to see some minor experimentation in future. They basically got it to the point where it would be hard to do *better*, but there are definitely avenues to do slightly different but just as good.
I really love the way the ears look in this maquette - that's pretty much the way I've been drawing/manipping them for years.