Hmm... something's wrong
I think that the proportions of Cameron's face are slightly wrong - as if her cheek bones are a little too pronounced, or her face is too far across. This might be an optical illusion, caused by the fact that you've painted in Landscape, as opposed to Portrait, but something seems amiss.
I can't place where I've seen that face before - some snobby English method actress is my best guess, but I can't really say, I'm afraid. Possibly a blonde and thin looking Sarah Ferguson, but that's probably beside the point... unless you're talking her Spitting Image character, that is.
I love your technique for the hair - it really works well and the whole effect is very pleasing. Plus, as with most of your other pieces, the eyes follow you around the room, which is a very difficult thing to achieve, so kudos is due there.
There really isn't all that much I can say about the background, since this postcard doesn't have one, so I guess you'll just have to compensate for the one issue and move on.
Can't win 'em all.
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