Cool as ass...I like Venom...I think he is spiderman's best villian( probably one of the best villains in the Marvel Universe in my opinion). As for your work my good man, I gotta say that bear was el correcto about the anatomy thing. Venom is a buff "Focker" compared to spider man, so those skinny legs won't do him any justice. As for the shading, I really can't say much about that cuz I'm still slightly new too.
A good tip though, for drawing super heroes would be to draw them in still-motion. Not exactly an actual animation, but more of a suspended animation type thing. You know, dynamic poses actually help give a character personality along with their designs and costumes.