One of the things often forgotten about Bizarro is that once you get behind the comical actions, the Bizarro-speak and thought process he is actually very very dangerous. All of Superman's strength, most of his powers but none of the self-control and mental stability of the man of steel makes for a disaster waiting to happen. You've caught that twisted potential for destruction very well here.
You do realise this picture cries for Batzarro and Bizarro Wonder Woman pictures to round out a Bizarro version of the DC trilogy of "Truth, Justice and Freedom" icons, right?
You call this a speedpaint, but this is better than a lot of art gallery work I've seen. Incredible depth and atmosphere. It really just needs a little bit of touch-up to smooth out the transitions and it'd be perfect.