Undergraduate / 'gender discrimination still exists in China' - Apply Texas Topic A [2]

I like your into but mention who you are talking about in your intro because if confused me about who you were talking about. Work on your grammatical errors but overall your essay seems good.

Letters / 'His technical paper' - review my RECOMMENDATION LETTER [4]

Its great, the recommendation not only mentions his academic achievements as well as personal ones too.

Undergraduate / 'Drawing and painting since childhood' - Common Application Essay of Your Choice! [2]

Love your topic and intro's first line. I think its great, good use of vocab, great sentences of different lengths. The essay tells what you like to do and what your aspirations are.