1. The analysis of each feature, assessment mark is 5 marks. 2. The analysis of each of the features, assessment mark is 5 marks.
Neither sentence is correct, and neither makes any sense. It is equally acceptable to use either "each feature" or "each of the features"; however, it needs to be clear how the noun phrase "The analysis of each feature(s)" relates to the rest of the sentence.
Why have you used a comma after "feature(s)"? What is the relationship between "The analysis of each (of the) feature(s)" and "assessment mark"? If it is a relationship of possession, you need to use either an apostrophe-"s" or the related genitive construction with an additional "of."
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