One from the vault. I drew this some time ago, possibly years, when I was experimenting with combining Asian imagery and Day of the Dead motifs (I guess, in so far as anything with a skull can be considered DotD). Like some of the recent posts, I started with a simple color scheme and it wasn't doing much for me. When I added the shadows and a light source, the image just popped. To illustrate my point, here is the original drawing and the in-between stage of the process.
You can also see what small touches were added digitally.