Final answer:
The primary focus in crafting an explanatory text portfolio is providing clear explanations and details, while also demonstrating growth in writing skills.
Step-by-step explanation:
When crafting an explanatory text portfolio, the primary focus should be on providing clear explanations and details. While creativity, artistic expression, and incorporating humor can enhance the writing, these elements should support the clarity of the portfolio's content. The use of descriptive diction and sensory detail can amplify the explanations, but the main goal remains to inform the reader effectively. It is also important to demonstrate growth in writing skills, show evidence of following revision suggestions, and uphold high standards in final drafts through proofreading and adhering to conventions.