Hello there! So cool illustration! :D What I'd do is push the lighting a bit more by using an overlay layer. You can just paint the edges of the skulls and bones to make the ghostly lighting of the character stand out more :D On the other hand, there's lighting at the bottom; you can do the same with an overlay layer to push the lighting and light some areas of the character, like the right arm and a bit of the contour of the jacket :) Hope this helps!
Thank you so much this genuinely helped me learn more about lighting so the shapes pop out more! ❤️🩹

