I wouldn't worry about the lines unless he starts showing signs of lameness. My yearling filly with 4 white feet sometimes gets those pink lines...though they don't come with changes in hoof shape or indentations or anything.
As for the shape, yep, he needs a trim...badly. While some foals can get away with not being trimmed if they have good legs and are on terrain that keep the hoof worn down, a hoof that grows improperly can cause leg issues. A hoof left too long the way his is growing can become a clubbed foot. Hooves that grow unbalanced can predispose a horse to arthritis and such by putting stress on young, growing joints.