The outside edges and tip of the beak have no blood flow through them and often are lighter in color because of that. Do you have anything in the cage for him to work his beak on like a hard mineral block or stone ? Shredding/chew toy's are also good for them...
He came down from Heaven unto this earth below
He came down from glory and praises untold
He came down to man fashioned in their way
He came down to rescue, He came down to save
The new growth on Joker's beak looks quite healthy.
Think of the beak as growing outward from the cere similar to the way a fingernail grows. The tip of the beak is the oldest portion.
As Randy indicated, the tip does not have blood flow.
Ensuring Joker has a cuttlebone, mineral block and a beak buffer will help him to keep his beak in peak condition.
I'd also suggest you add ACV to his water if you don't already do so.