I've got a 'main' Christmas present for my 14yr old niece and want to buy an additional present of around £10. She's obsessed with make up, studies all the YouTube videos and practices for hours, and she's good at it - her make up always looks appropriate (for her age) and stylish - actually I'm quite envious 
So the additional present should be make-up based. What would you suggest? I was thinking:
MAC voucher
Palette - but what brand, eyes, lips???
Brushes
What would you buy?