I really want to work on improving my portraits. To help with this I try to regularly (well that's the plan) do studies of different face parts in the hope that they will all come together eventually.
Here are some nose studies I did from a variety of photos I found on the internet. At least they all look like human noses. I paid particular attention to shading around the nostril and not just leaving a black hole. I think it helped a lot. I am really quite pleased with the form and shape I am getting now.
It's what they say... practice, practice, practice.
Now to do some eyes and mouths.