Almost anything a copy editor would attend to falls under the heading of Conventions. Errors tend to be so few that just minor touchups would get this piece ready to publish.
Spelling errors are frequent, even on common words.
Spelling is usually correct or reasonably phonetic on common words, but more difficult words are problematic. Spelling is generally correct, even on more difficult words. The punctuation is accurate, even creative, and guides the reader through the text. Capitalization is random and only the easiest of rules show awareness of use. A thorough understanding and consistent application of capitalization skills are present.