This is a very cute and happy pic. The facial expressions are vibrant, and the body poses are both dynamic, and in sync with one another.



More succinctly, what this picture also speaks of is probably what it would mean to have a role model. From what was seen in the show, Celestia was the one who inspired Twilight to study magic. Having the opportunity to be taught a skill by the person who inspired them down that path, and to also have the opportunity to develop a closer relation with that person, is reflected well in this pic. This is particularly so Twilight's facial expression, the way she is literally holding on to her, and the way Celestia is validating the expressions with her own facial and other nonverbal cues.



Again, the main theme in this pic may be symbolic of what it could mean to have a role model growing up.





It was also just noticed that the horns (unicorn horns) of both are facing the exact same angle. On a personal level, this may symbolize both having the same path (being along the same line figuratively, or of both now traveling down the same road).