I can really only talk about the items I have available. Items for sale allow you the rights for commercial use for images, so you could use them in your comix. Since you bought it, you gain image rights and do not need to gain permission from me to use them in commercail images. The free items are pretty much the same, except I do ask that credit be given for the props used, and that you tell me what you are doing with them (mostly FYI for me) I ask that because if I like your idea I might be in a position to make props for you.