Monica Johansson sent a comment to the last post.
All I can say about painting is just practice. If you can take classes do so. It is what got me started.
Really look at what you are painting. Don't be afraid to experiment.
I found that a tiny dot of paint can be moved with a shader brush to give detail.
Look at the nose. There is more to the nostril than a line.
There is a hole that needs defining with a darker color. The shape is like a comma. The nose has 2 defining lines on the outside but also on the top there are soft lines defining shape and detail..
For me I could see the detail but did not know how to achieve it. Messing with the paints and practice helped.
I still have a long way to go but I keep trying.
With oil painted dolls I never know when they are done. I have repainted many dolls.
Share pictures if you can.Have a good week. j