阅读下面这首宋词，然后回答问题。
添字采桑子·芭蕉
李清照
窗前谁种芭蕉树？阴满中庭。阴满中庭，叶叶心心，舒卷有余情。　　伤心枕上三更雨，点滴霖霪。点滴霖霪，愁损北人，不惯起来听。
[注] 该词作于作者南渡以后。
请简要概括上片中芭蕉树的形象特点。(3分)
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词人在下片是如何抒发思想感情的？(4分)
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