I think this would be a natural way of saying it, and I don't think the Spanish expression implies anything more specific. A card metaphor in English, "shuffle the cards and deal a new hand", or something like that, would be understood but it wouldn't be as idiomatic as the Spanish. I don't think "barajar" implies re-using elements of his previous art, mixing them up in a different order. It's just a way of saying draw a line under what has gone before and start something new.

Something like "go back to the drawing board" would work in some contexts, but referring to an artist it would sound like a heavy-handed pun, so I wouldn't use it here.