Hi,
it was a tricky challenge, I had to retry a few time, because I had completly detroyed my mesh topology. I managed to get an acceptable result:
But there is an artefact in this one 
Here:
A self-intersecting face loop, I didn’t know it could exist
I was happy with my nose, but I think I will start again from the base once I saw Michael’s solution, it will maybe help me getting rid of that artefact
I have to work hard to master the creation of a nice topology, I feel like mine is a total mess
Cheers !