Did you try the following?

1. Targeting the spell on the portrait, not the corpse.
2. If that fails, did you save, then reload and retry 1.
3. Did you try teleporting the ashes or the robot?
4. Proper RPG mechanics do not include a dead character getting back up, is this some final fantasy rubbish?
5. Heal more!
6. Try leaving the area then returning to see if the corpse vanishes.