what does he look like?'标准用法,地球人都知道是询问某人长相的意思.
回答：
He has straight hair.
关于'how does he look like?'需要好好分析一下语法结构.
一,He looks like a soldier的问句--->
"he looks like what"--->
What does he look like?
二,He looks like his father的问句--->
"he looks like who"---->
Who does he look like?
三,He looks well.He looks sick.的问句--->
"he looks how"---->
How does he look?
所以从‘三’的可以看出由于he looks like sick不是标准英语,所以'how does he look like?'也不是标准的英语.
所以我认为,‘how does he look like?’是不地道的英语.
再补充一下：
A person "looks like" something or someone.
或者
A person "looks" somehow .
但
A person can't "look like" somehow.