Even the dullest bird or face becomes interesting when you give it a good look in the wild/flesh. The way the shadow drops across the cheek, the light hits an eyebrow, etc... there are many more angles, positions etc. than you can ever imagine. My heart always makes a little jump when I see things in birds or faces that surprise me.
I've been drawing authors and politicians for newspapers for many years. I try to read up on the person; in the case of authors, read one of their books. I watch interviews via YouTube and collect pictures via the Internet.
I don't use names or captions for my many portraits of politicians and authors for newspapers. The drawing has to be self-explanatory, so I spend a lot of time sketching to find an idea and an angle that is clear.