Answer:
carte blanche
Explanation:
The meaning of carte blanche is total freedom to do what you want, or what you think is best. So, since he was so famous, they let him have complete control on how to design the mural.
Hope this helps!
A supporting character<span> is a </span>character<span> in a narrative that is not focused on by the primary storyline, but appears or is mentioned in the story enough to be more than just a </span>minor character<span> or a cameo appearance.</span>
