Potential face claims for Arthur Weasley:

NAME: Mark Williams
DATE OF BIRTH: 22 August 1959
NATIONALITY: British
EYE COLOUR: blue/grey/green
HAIR COLOUR: greying/red

NAME: Kevin McKidd
DATE OF BIRTH: 9 August 1973
NATIONALITY: American and British
EYE COLOUR: blue
HAIR COLOUR: red

NAME: Damian Lewis
DATE OF BIRTH: 11 February 1971
NATIONALITY: British
EYE COLOUR: blue
HAIR COLOUR: red

NAME: Seth Green
DATE OF BIRTH: 8 February 1974
NATIONALITY: American
EYE COLOUR: green
HAIR COLOUR: red

NAME: Tom Goodman-Hill
DATE OF BIRTH: 21 May 1968
NATIONALITY: British
EYE COLOUR: brown
HAIR COLOUR: red

NAME: Tim Roth
DATE OF BIRTH: 14 May 1961
NATIONALITY: British
EYE COLOUR: green
HAIR COLOUR: dark blonde

NAME: Eddie Redmayne
DATE OF BIRTH: 6 January 1982
NATIONALITY: British
EYE COLOUR: green
HAIR COLOUR: red/brown/black/blonde

NAME: Tom Hiddleston
DATE OF BIRTH: 9 February 1981
NATIONALITY: British
EYE COLOUR: blue
HAIR COLOUR: blonde/black/brown

NAME: Rhys Darby
DATE OF BIRTH: 21 March 1974
NATIONALITY: New Zealand
EYE COLOUR: brown
HAIR COLOUR: brown/red

(suggested by caffeineshakes and kencbi)