Field of View not equal with Morrowind
OpenMW defaults to a FoV of 55, which is narrower than Morrowind's 91,3 on a 16:9 aspect ratio. After some playing around with the FoV slider I've found OpenMW's FoV of 60 to be the closest.
Suggestion: Change default from 55 to 60 to match Morrowind's FoV.
There's also a thing with the first-person models, in this case the caster hands, being too close. This doesn't change with the FoV so it might not be related.