Hello Mari:
Congrats! I don't know if this is your first master copy or not, but you did a good job here. I hope you learned a lot from it.
My comments:
I see a definate style in how you applied your strokes. Quite bold and brushy. This is a valid style and I hope you were trying to do that. If not, then you have a natural tendency for it - explore it.
The scan looks a little yellow to me - is the original that way?
Keep an eye out to the features - the right eye looks a tad off and the nostrils are flared out farther than MBs subject were.
You established a good palette of values and the 3d impression comes off nicely.
Her eyebrows seem to be darker than her hair. I might lighten them somewhat.
Nice work on the ear! Ears can be hard to paint.
The garment looks gray/yellow and somewhat dirty. I might punch up the highlights.
You seemed to have used a warmer palette than he did. Again, is this just the scan?

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Can you share what you learned?
What frustrated you most?
What you found easiest about it?
How did you go about reproducing this work? What steps did you go through?
Again, quite nice!