Masara is the joint nickname of several Chinese artists of the circle ACGARTS. They have two different Pixiv accounts, one in Japanese, one in Chinese.
マサラちやん Pixiv (JAP): http://www.pixiv.net/member.php?id=1918600
Masara_阿飘 Pixiv (CHN): http://www.pixiv.net/member.php?id=2569740
Circle HP: http://www.acgarts.com
Circle blog: http://blog.acgarts.com