We don't know what Marta felt; all we know is her face seemed unhappy, and this expression occurred when she looked at Alex, not when he left. At any rate, the question could be more challenging. I'll leave that to you.
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Thinking SpainAre they more accurate now?The first one is better, yes. You might want to consider killing two birds with one stone by testing the students' comprehension and vocabulary:
a) What did Marta feel when she looked at Alex? Unhappiness.
b) How was Marta when she looked at Alex? Unhappy.