Wow, you really captured the feeling and emotions here. Great brushwork my friend!
Personally I have nothing against mixed medias techniques,
in our times is possible almost everything at this level.
On the other side you probably know that we have several methods to speed the drying oil paint on canvas.
Your technique is very Alla prima and with a good medium is no problem to have a paint dry from one day to the next day.
Your Father's portrait is very expressive and moving.
I am sure you would be able to make an excellent portrait of the poet Pavese eventually .
Wow! Very active painting.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream
Wow indeed. Love the end results...