Medusa:
There's some camera shake, and the animation is a bit rough, but the effect itself looks good.
The ending look is great, and I like the greyscale feel. The transition from not-stone to stone seemed to have a few rough edges, but after cleaning that up and eliminating the set bumps it'll be a pretty sweet effect.
Storm:
The lightening looks good, but the bumpy figure and light flicker ain't so hot.
It needs some sort of animation going on, and then preferably the use of a flashlight to get some nice in-set lighting effects. It could also use a brighter glow around the staff head where the lightening is hitting.