写好英语明信片作文可以遵循以下几个步骤：

开头问候

使用温暖的问候语，如 "Dear [Recipient's Name],"。

表达祝福

简短地表达你对收信人的祝福和问候，例如 "I hope this postcard finds you well."。

分享信息

简要介绍你当前的位置或活动，如 "I'm writing to you from [Location]."。

描述体验

分享你在那里的经历或感受，可以是风景、文化、食物等。尽量使用短句和标点符号，使信息简洁明了。

结束语

用一句温馨的结束语收尾，如 "Give my best wishes to [family/friends]."。

签名

最后别忘了签上你的名字 "Yours truly," "Best regards," 或 "Love," 等。

```

Dear [Recipient's Name],

I hope this postcard finds you well. I'm writing to you from [Location]. It's really beautiful here! The sky is so blue and the air is fresh. I've been exploring a lot and have seen some really interesting things.

In school, I've learned a lot this year. My favorite subject is science because we do a lot of experiments. I also like math because it challenges my brain.

I miss you all so much. I can't wait to come home and tell you all about my adventures. Please write back soon and tell me what's new with you.

Take care and I love you!

Yours truly,

[Your Name]

```

通过以上步骤和示例，你可以撰写出一篇简洁、明了且富有情感的英语明信片。