Artist Nathan Wyburn has teamed up with charity Save the Children to promote its flagship fundraiser Christmas Jumper Day by creating a portrait of Welsh-born and Hollywood actor Luke Evans out of Christmas jumpers and decorations. Christmas Jumper Day is back for the sixth year running on Friday 15th December and is expecting over 5 million people across the UK to take part to help raise money for vulnerable children around the world.  Taking part is simple by signing up at christmasjumperday.org, sticking on a…