I've recently taken a design class and I have a keen interest in design in general, and I would say your suggestions are on the money.

I would also mention the importance of layout and flow line, or how will you organize your elements in the page and how will your audience traverse them visually? This is something you really ought to think about very hard.

Also, learn about gestalt principles. For example: https://www.howdesign.com/resources-education/online-design-...