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At first glance it appears large. But as you said, it may need to be large to serve its purpose as a dive watch.
We tend to become accustomed to what we see regularly. Meaning, if you wear it often it won't seem so large.
A big issue for me is thickness. A thick watch to me is uncomfortable. The only watch i ever returned was a new Hamilton intramatic. It had a smaller case size but sat too high on my wrist. The opposite is true for me, a thinner but larger case can be comfortable.
Looking at your wrist shot again, it doesn’t seem as large as when I first viewed it.
Good luck with the decision process.