Hey there, thank you for stopping by my thread. Here's my feedback for you, since you asked:
I think the idea is really cool, a corrupted/demonic monarch with all the possibilities for grandeur yet sinister taint. I love how you have a story for each prop. I think looking for a more big-picture visual hook that doesn't require word explanations will help take your piece further and make it stand out. As a central prop, the crown designs should be a focus and it should be memorable and iconic. The character's outfit could also be pushed further, more interesting than the usual royal attire - the crown on the shoulder is a cool touch, maybe design the outfit around it? Make everything a bit more yours and push further from generic, vague ideas. Have a lot of fun and looking forward to see the evolution of this piece ^^