The brute silhouette has always included big, exposed teeth ever since Halo 2 (Let pretend reach’s brutes do not exist). In my opinion and aside from infinite, halo 2 anniversary’s brutes were the absolute peak of brute design. Their beady evil eyes, their big scary teeth, their angular faces all nails the angry, animalistic nature of brutes. So far, while infinite’s brutes look like they have most of these traits, they are missing their iconic spiky teeth protruding from their mouth that they last had in halo 2 anniversary. This is quite a feasible task for 343i to manage seeing that it’s just the teeth that needs to be enlarged, as well as a few facial bones and facial resting positions that need to be slightly adjusted to avoid teeth clipping with lips. Big teeth are a small trait of the brute design; to which, if added, it will dramatically change the outlook of brute faces. Brutes in Halo infinite absolutely need to have their big spiky teeth back. It will give brutes an angrier face and it will be faithful to old and even new (H2A) designs. Brutes with spiky teeth are simply a better design.
These Brutes are far less animalistic. It fits the lore. I honestly think is the best design they have ever had.