Nice detailed sketch
I think that you friend was right to keep bugging you about this - it was well worth it and as a result, you've got a very nice looking piece out of it. While I'm not sure what the two streaks of "background" were on the right hand side, it's really the only blemish on a wonderful looking piece.
I would have said that more detail could have been put into the image, with more pencil strokes perhaps starting to construct a background or even an outline that faces into the white of the background. It's very well constructed and as a result, you've got a nice piece to show off your skills. Perhaps you need to do more of these style works with this model and convince your friend to pose more for you - sort of returning the nagging favour ;)
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