To make certain the look of the sets and props match the imagery of the comics as closely as possible, I’d bring Chris Gossett on as a concept artist.
In terms of music, I’d move away from a John Williams-inspired classical score and instead go for something ambient and electronic – something similar to Tangerine Dream’s score for the American cut of Legend.
Unfortunately, when it comes to actors I can only picture ones who are now too old to play the parts.