>>8112618>>8112686Two tips for Venom, you can swap the ball joint in his head with the double-ball in the packaging for a more close mouthed look like pic related.
And, if You don't want to bother with glue or floor polish, you can also just take some of that plastic film that comes in the figure's joints and shove it up into any of the peg-holes that the ball joints socket into. It's a quick and easy way to tighten things up.