I suspect the photo was a kind of test to see if the target was asleep at the wheel. If the photo had been instantly recognized, the scammer would have simply moved on in search of softer targets.
I have no idea why they used that picture - they took a template driver license, populated it with the guy's personal information, pasted the picture on it, then faxed it to us. I suppose they figured it would be so grainy from the fax that it wouldn't be obvious, or maybe they just did it for the lulz.