How can Nie Li write English well?

Whether it looks good or not depends on your calligraphy, and it has nothing to do with the name itself and the writing font. In English, "Nie Li" can be written in Chinese pinyin Nie Li, or it can be spelled as Nyeh Lee in English (the letter H is silent and only serves as an [ai] to prevent Y from being pronounced as an opening syllable). What font to use can be decided according to your own preferences.