I don't know her name and/or the series she's from, but when buriki uploaded a sample on his page, http://afortoftinplate.web.fc2.com/, he wrote:

buriki said:
TECH GIAN4月号（2月21日発売）付録DVDのパズルゲーム『少女領域』で
ご褒美イラスト3点を描いてます。トナカイ娘です。
…って一月後かこれっΣ

since I can't read Japanese:
techgian
puzzle game called 『少女領域』 shoujo ryouiki?
reward illustration, reindeer musume