I’d argue that is not the most ideal Prolog solution. More like it’s simply a recursive implementation of an imperative solution.
For fractals you’ll want to be able to recognize and generate the structures. It’s a great use case for Definite Clause Grammars (DCGs). A perfect example of this would be Triska’s Dragon Curve implementation. https://www.youtube.com/watch?v=DMdiPC1ZckI