"sea coming suddenly ‘round the cape’." what about spring tide? (although your interpretation is good too)
Here is a link about why I think the lady of shalott would be a way to say about more about society. I agree that it is a bit far-fetched for this browning poem, but well, if the teachers ask for it, all we can do is comply.
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Upon fourth reading, I must say you and Hugh convinced me (and how I hate it ;-) . The speaker in the second part is most likely the man and the sun the him, as the sun is already personified in the second line:
And the sun look’d over the mountain’s rim
However, this makes it even harder to say anything about individual and society if you can't even link it to the difffence between women and men. Apparently, the woman is good to spend a night with, but he needs men to live??