Changing into an alicorn isnt all pretty pink sparkles and song numbers. It is a painful process that very few ponies manage to live through as most end up dying or going crazy as a result of the excruciating pain. Unicorns must first develop their own personal magic, which is in itself an arduous task, one which takes many years to hone. Once a unicorn’s magic is strong and stable enough they must undergo the transformation…
(this is my headcanon about alicorns. Posting it on DA, from my tumblr, because, why not?)
Great idea and picture! Reminds me almost of transformation's in dbz due to my headcanon being that the screams (particularly in frieza and cell's case) are due to the transformations being painful. I mean growing bones and having new muscle layer on must hurt like hell. Imagine what an earth pony would go through