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I am trying to find some adjectives to describe one's appearance and need your help. I will write some body parts and kindly supply me with some adjectives.

lips:

shoulders:

arm:

leg:

Are these sentencs right in terms of punctuation?

I have knee-length black socks.

I have meduium-length, wavy brown hair.

Also, I have seen a lot of descriptive sentences with the adjectives "large" and "big" to describe the same physical spots, like large ear and big ear, large forehead and big forehead, etc. Do you have any pointers to guide me in making those distinctions better?
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Some adjectives:

lips: full, thin

shoulders: narrow, broad, square, sloped

arm / leg: brawny, scrawny, sinewy, slender, sturdy, shapely, thin

Are these sentences right in terms of punctuation?

I have knee-length black socks. YES

I have medium-length, wavy brown hair. YES

Also, I have seen a lot of descriptive sentences with the adjectives "large" and "big" to describe the same physical spots, like large ear and big ear, large forehead and big forehead, etc. Do you have any pointers to guide me in making those distinctions better? -- EITHER WILL DO.
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you.

For those two sentences below, The apparent differences between the two is the inclusion of a comma in one that has one more modifying adjective, "wavy," and the non-inclusion of a comma on the other one.

I think the reason for the placement of a comma is one is that it is an widely acceptable practice that a sentence would not normally have more than two like-kind adjectives without a comma.

I hope my argument made sense. What is the reason for the inclusion of a comma in one sentence and the non-inclusion in the other sentence?

I have knee-length black socks.

I have medium-length, wavy brown hair.
Your reason is the one that caused me to ignore the difference. It is a matter of length-- how much like a list the adjectives appear to be.