First of all, that pose is adorable, with one ear up and one down, the crossed hooves, the delightful grin, and the cute blush. Looks like she answered a question of Celestia's perfectly... The pose looks natural and comfortable, and fits with the show style. The shading, though simple, gives a nice feeling the the piece. The background fits her nicely (looks like the sky at twilight!), and the white boarder around Twi makes her stand out nicely.