I've been using 3D models as a drawing aid for nearly 10 years now. Not only did it teach me how to navigate 3D space and pose them naturally, but it also saves me a ridiculous amount of time on each drawing. If someone tells you it's "wrong," they're talking out of their ass...
Also, I made a little comparison... This is what happens to your art style when you pull up to the yaoi factory with your favourite character EVERY DAY for TWO YEARS