How to Practice Drawing From a Photo (Can work in Traditional Art)
So, I started this already, but allow me to show you how I capture accurate proportions when drawing from a photo.
Make a new layer.
On your new layer make a grid that matches your photo. Label the grid to keep yourself in order. Instead of focusing on the entire picture focus on one square at a time.
This allows your brain and eyes to learn to focus on one piece of a photo at a time. One day you find yourself rarely needing this anymore. but, never fret to check your accuracy with a grid!