The nose so far.
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I've extruded the marked edges and formed the inside of the nose.
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The nose after smoothing.
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As you can see I'm still playing around with the area under the chin.
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Some more changes.
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If you're having problems with a area... Sometimes it can be quicker to just select all the edges and delete them and start again, rather then keep playing around with the points.
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Creating and deleting the edges until it looks good.
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Now cleaning up the bottom part of the neck.
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More 3D Graphics: 
