speed of the gif besides, the ash crumble part looks good, but the rest could use some work. maybe he should just turn black instead of white?
Add more instances of the same image to make it longer :3
The white is likehim being vaporized
No, that's him being ash...ifiedhow about this?
Try making the black start in a little circle in the center of his chest, then expanding out to envelop his whole body, then having him crumble into ash.