There's often some head movement but a lot depends on whether the animal is moving or not and other things. Another factor is how or whether the animal is looking at you. For example, If it has seen you and feels threatened, it may well try to make itself look bigger and will hold it's head higher and at a different angle. (kinda with it's chin tucked in). In a full out serious charge the head is held considerably lower.

Ganyana is probably the forum member best qualified to advise on this.

2 Good books to read on the subject are Mahohoba by Ron Thompson and The Perfect Shot by Kevin Robertson.

I didn't take this pic so can't claim credit but I understand the photographer is now dead and the pic is in the public domain - hence I feel I can post it - but here's a pic of an elephant in pissed off mode - note how low the head is held. From my experiences it's unusual for the ears to be that far out.... but I'd look forward to hearing Ganyana's comment about that.:-