I am not in art school, & do not have enough time to study sketch or painting... I always spend a whole night on those sktch... so, as a guy in the best art college in China, please help me and give me your advice~

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不错 但是建议开始写生

写生 ??I don't have enough time......School work is too heavy

which cantury are you in ! /?And are you CHINESE?if you are chinese please say zhongguohua 还好了 我觉得要注意下手的结构关系 还有就是画的稍微有点僵！

I am now in US... not easy to type in chinese, sorry

很有天赋的一个人你可以画自画像 也可以写生自己的手

自画像? Like this?

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有些板 但结实

What do u mean "板"??

means not untrammeled and not refreshedingyour line looks not vivid and vigorous your actual situation is very good!!!

How to improve??

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