The best piece of writing advice I got when first starting off in switching up Points of View was to imagine a pair of glasses, – my book’s world would be viewed through those glasses, and POV was basically as though one character had taken those glasses and put them on.
What would you see through those glasses? What would they take in first? How would they feel? Probably not the same as all the others.
If there’s one huge importance in books with Multiple POV, it’s the fact each POV has to bring something distinctive to the table.
If every single POV is going to be the same type of thought – the same personality, the same opinion on everything, then the reader will get muddled up. The temptation, then, is to make every single character’s POV absolutely larger than life or very much stark contrasts to each other, which in theory can work. But most books benefit from the vulnerable, or ‘quiet’ POV, where the character may not be the most talkative or the boldest, but rather offering a unique perspective.
POV is all about highlighting the nuances of what makes that character valuable to the story and different to the others.
If you have a major cast with distinct personalities then switching up POV will work absolute wonders. In my recent YA Fantasy I have three POV. The only reason I went with three for mine and not two, was that I knew each of them would bring a totally different opinion and nuance / arc to the major plot.