Agreed!

In "My Last Duchess", is there any significance to the last three lines about Neptune taming a sea horse?

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Browning wanted to indicate that this room contained a number of works of art. It seems to be the Duke's private study or library. He has brought the visitor up here for a confidential discussion about the dowry of the girl he expects to marry. In the monologue it would not have been convenient for him to refer to other works of art in the room, but calling attention to the sculpture of Neptune taming a sea horse is a way of suggesting that there are paintings and sculptures in various places. The Duke also seems to be trying to delay the visitor's hasty withdrawal. The Duke is obviously surprised when the visitor suddenly jumps up and starts to leave without a word of explanation or apology. The Duke says, "Will't please you rise?" And then, "Nay, we'll go / Together down, sir." The visitor was going to leave the Duke behind in his hurry to get away from him. The Duke is not satisfied that they have agreed about the terms of the dowry. He didn't expect this interview to end so abruptly. He asks the visitor to "Notice Neptune, though." He would like to hold the man there for further conversation. The actual sum of the dowry has not been settled. They only came up here away from "the company below" on the pretext of looking at art but for the main purpose of talking about money. If the Duke could have enticed the visitor back to look at Neptune, he might then have directed his attention to other artworks and drawn him into further conversation about the dowry. The Duke doesn't realize what a terrible impression he has made on this representative of his fiancee's father and that he may have even talked himself out of the marriage.

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