たんプリ4話でバリアを張るミスティックの模写です。
可能な限り大きな四角を描くためか、膝を曲げて少しかがむこの仕草が可愛いな、と思ってます。

It's a drawing of Cure Mystique creating her barrier from episode 4 of TanPre.
I think the gesture of slightly bending her knees and crouching is cute, perhaps to draw the largest possible rectangle.