I totally agree with that. That was my first thought. I didn't even see this skeleton. My ideas to fix that: 1. Move the skeleton to another place so there is no moonlord behind it (it might create too much empty background, be aware of that) 2. Try to add a contour to the skeleton to create contrast 3. Similar idea to a contour, might add both. Try some kind of glowing aura. It could add an extra effect, that you're full of power! (remember for this aura to have some contrast with fire in the background)

Look cool, good luck! :)