You have made so big progress in Chinese!【And what really surprised me is your perfect handwriting.】
评价：正确的句子,含义略单调
修改：
You really improve a lot in your Grammar【完成时!】, sentence structures and language applying. I’m sure you will make bigger progress in future.
评价：时态不对,内容可以
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【新段】
【However】 Your letter【also】 has some mistakes.
评价：转折连词在哪里!这很关键,段与段,句子与句子之间一定得有联系.内容不能显得太突兀.
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You wrote some Chinese characters in a wrong way.
评价：怪怪的
修改：You made a few mistakes. Some Chinese characters you used is not proper.
I think (practicing writing them and reading Chinese books)【reading and writing】 are good ways to correct writing errors.
评价：总体还行,有点罗嗦
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Also, there are some sentences which are hard to understand.
评价：语态错!被动
修改：be understood
Listening to Chinese broadcasting, and watching Chinese movies【also】 can help you experience authentic Chinese life. As for grammar, there is also some (grammar) mistakes.
评价：啊哈哈哈中文有语法?
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Grammar of Chinese language is not that difficult.
评价：我承认
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I think you’ll soon correct them after paying efforts.
评价：不要老用think ,suppose consider什么的都可以的.句子很好
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【新段】
I am attaching an English travel note to this email. Looking forward to your reply.
评价：乱错,时态&没完成题目要求的作文内容
修改：An english travel note is attached behind the letter, and what I need is your precious comment.
总评：首先题目要求内容必须完成.内容还可以充实,连接词加强,过渡加强.用词可以再好些.