The big thing is to show how versatile they are. The more posing morphs, the better. Especially ones that show expression. Also include pose files to place the object on Mike (or any other figure who's buying base you want to sell to - looks like #2 would be nice on Vicki). Texturing can also be a problem with this kind of substitution prop. If you're marketing to the Mike base, then include a Mike body texture to match the head textures you distribute with the heads. Another way of doing this is to take the head of a standard figure and morph it into faces. N0s4aT2 has done this for Mike and created a great pig, wolf, and devil morph. Then you don't have to worry about texturing or expression morphs since the new head would use all of Mikes. They look pretty good. I love the big guy to the right.