Allesandra,
The problem with working and learning from photographs is our eye does not learn to properly see.
When you are working from life you start with the bigger shapes and keep refining them. You learn to edit out the unimportant parts and keep only the ones that matter the most. This process helps not only your drawing and painting skills, but helps toward developing a unique style.
Might I ask, what kind of drawing teacher gives students pile of photos to copy?
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