There’s a saying, that if you are going to critique someone you should first walk a mile in their shoes. That way, when they get mad, you’re a mile away and you have their shoes.
But, what do their shoes look like? Are they wearing sneakers? Heels? Work boots? What color are they? What kind of fabric are they made of? Do they have a design on them or other embellishments?
You need to know this information if you are going to wear them and critique them. You may be thinking, “I don’t want to critique other people.” But you do want to critique the people in your book so that your readers can relate to them.
In order for your readers to fully relate to your book, you need to have a real setting, real situations, and real characters (who wear shoes). So, what do their shoes look like? And, do they match the shoes of your reader? A man who spends his life in work boots may not be able to relate to a character wearing golf shoes.
All this talk about shoes has a point. Go in depth with the details of your characters and make sure that your characters are relatable to your target audience. You could also go shoe shopping if you want to.