pseudomonarchia

Hey everyone, first post here so formatting may be weird. I’m currently trying to recreate the crown prop from Hereditary with leather and I cannot figure out how to make these bumps (shown in picture). Anyone know how I can go about doing something like this? I have some super basic leather experience so I wouldn’t say I’m a novice, but I’m definitely not seasoned haha. Any tips are appreciated because this is driving me crazy.