Potential face claims for Helga Hufflepuff:

NAME: Miranda Otto
DATE OF BIRTH: 16 December 1967
NATIONALITY: Australian
EYE COLOUR: grey
HAIR COLOUR: red

NAME: Gugu Mbatha-Raw
DATE OF BIRTH: 21 April 1983
NATIONALITY: British
EYE COLOUR: dark brown
HAIR COLOUR: dark brown

NAME: Katheryn Winnick
DATE OF BIRTH: 17 December 1977
NATIONALITY: Canadian
EYE COLOUR: blue
HAIR COLOUR: blonde

NAME: Deepika Padukone
DATE OF BIRTH: 5 January 1986
NATIONALITY: Indian
EYE COLOUR: dark brown
HAIR COLOUR: dark brown

NAME: Sophia Myles
DATE OF BIRTH: 18 March 1980
NATIONALITY: British
EYE COLOUR: blue
HAIR COLOUR: blonde/red

NAME: Brigid Brannagh
DATE OF BIRTH: 3 August 1972
NATIONALITY: American
EYE COLOUR: brown
HAIR COLOUR: red

NAME: Felicia Day
DATE OF BIRTH: 28 June 1979
NATIONALITY: American
EYE COLOUR: hazel/green
HAIR COLOUR: red

NAME: Solange Knowles
DATE OF BIRTH: 24 June 1984
NATIONALITY: American
EYE COLOUR: dark brown
HAIR COLOUR: dark brown/black

NAME: Angel Coulby
DATE OF BIRTH: 30 August 1980
NATIONALITY: British
EYE COLOUR: dark brown
HAIR COLOUR: dark brown

NAME: Karen David
DATE OF BIRTH: 15 April 1980
NATIONALITY: Indian and Canadian
EYE COLOUR: dark brown
HAIR COLOUR: dark brown

NAME: Tamsin Egerton
DATE OF BIRTH: 26 November 1986
NATIONALITY: British
EYE COLOUR: brown
HAIR COLOUR: blonde

(suggested by LeviosaDragon, -sophiesticated, HighHippogriff and kencbi)