A basic piece of advice in art is that when learning how to draw, you must draw from life. Once you understand a subject thoroughly in 3D, you can then draw from photographs without making the subject look flat.
Sometimes my live models are actually alive:
|Son2 posing for me a few years ago|
|female Northern Parula that crashed into our window|
"There is no such thing in anyone's life as an unimportant day." – Alexander Woolcott