you can do better.
1st off: Don't use C4D's built in models if their not modified. it makes you look lazy.
2nd off: the legs (as stated) are way off, try doing that in toribash (bet you can't ;P)
3rd off: It's nice that you're trying out more complex scenes right off the bat, but learn the basics first (looks like you almost have them)
it's an ok render for your first, remember: never give up, you're at the bottom, but there's nowhere to go but up.