Very nice; the shading is awesome and the background is very imaginative, although being simple. I like the details that are "hidden" in this pic like the glowing necklace or the sun rising (or setting) far on the horizon in the corner. Bravo.
Within Aurora's world the Leylines of power that crisscross the world are rivers of unshaped wild magic - and to the north of her lands exists a place where these currents of magic are quite unstable. This place, known as the Broken Leylands, occasionally creates magical tunnels to unusual locations and does so with little rhyme or reason.
Aurora's talent lies with these magical 'rifts', and her cutie mark reflects this with symbolized magic flowing into and out of a circle that denotes a gateway.
While she is the regent of Roanoak, a kingdom far to the south of Equestria, and her responsibilities are to the ponies who live there - she also looks after the Broken Leylands, and lends a hoof to 'accidental tourists' looking to return home.