Just a thought for anyone having too do portraits from photos.
Even if they threaten to break all your brushes!
Always work from photos that you yourself have taken. Any problems that then occur will be from your own lighting etc. And be sure to make the photos large enough to really see & understand any subtleties.

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Comments
I'm so old school and so stuck in my old ways, although in this case I've tried to adhere to Marks methods when trying to do a portrait.
I have put the photo that was given to me by the client ( I have now sworn to always take my own photos!) taped it to board with acetate over it to be able to test the my mixes against the photo.
I don't premix, and the light I use is an ott-lite.
I know I would not be struggling this much if I had started with the way Carder suggests.
P.S. I do paintings from my own photos and others. For my main work, things that I want in a portfolio and consider my real art, I take my own photos. For sketching and practice, I just use any photo from the internet. These pieces don't go into my portfolio though because I didn't take the photo.
Personally, I find nothing as rewarding or exciting as painting from life.
The warm aspect is ok I think. Any way here's where she is now. Not totally there yet, tough little painting!