"a heart – how shall i say? – too soon made glad. too easily impressed: she liked whate’ershe looked on, and her looks went everywhere."
explain the above poem.

The above lines are from Robert Browning's "My Last Duchess". It describes the duchess in the words of the duke. The Duke is saying that his wife is easily impressed, she likes everything she sees and she sees everything.

Explanation:

My Last Duchess by Robert Browning is a poem about the Duke of Ferrara describing the portrait of the Duchess, his wife. The above lines "A heart- how shall I say? - too soon made glad. Too easily impressed: she liked whate’er She looked on, and her looks went everywhere." were the description of the duchess by the duke. He's saying that she finds happiness easily, everything makes her happy and she gets impressed easily. And that is what he doesn't like. According to him, this is the problem with her. In other words, he is complaining that she's not leaving even a spot of joy for him and he's jealous of that.