Hey Juggy, what's poppin off? You know what I noticed about your sigs? When you render a character, try going with the same sketch artist if you can, this will bring more balance to your sigs. Also, try to blend your font more, so that it doesn't over power your picture.
Here's a good tip if you use Photoshop... control click on the layer that you rendered (take Venom for example) go to select _ Modify_Contract by 2 pixels... go back to select and Inverse.... now go to filter_Blur_Gausian Blur_ set it at 1.2. Go back to Select_Inverse once more.... Last step! Select_Modify expand_5 pixels and deselect your image. This will give you a clean edge, and reduce the jagged edges significantly.