Dr Ashdown-Hill, who wrote The Last Days of Richard III, said: "The most obvious features in portraits are the shape of the nose and the chin and both of those are visible in the facial reconstruction."
Richard III Society member Philippa Langley, originator of the search, said on a Channel 4 documentary earlier: "It doesn't look like the face of a tyrant. I'm sorry but it doesn't.
"He's very handsome. It's like you could just talk to him, have a conversation with him right now."
Layers of muscle and skin were added by computer to a scan of the skull and the result was made into a three-dimensional plastic model.
The Richard III society will officially unveil the reconstruction at 10:00 GMT on Tuesday, at the Society of Antiquaries in London.
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