well, i made the originals, and these look like an acid trip while trapped in MS paint...
even for zombies, which should look haggard...
To make suggestions i would say go to wikipedia and read about Vectors
http://en.wikipedia.org/wiki/Vector_graphicsdecals and faces made in vector form are easier to work with anyways.
plus they look nicer in my humble opinion.
then i'd say to download a program called inkspace
http://inkscape.org/inkscape is to vectors as what gimp is to bitmaps.
its the best freeware vector constructor out there.
learn vectors, and practice. Practice PRACTICE!
Note: If you need a tutorial or a template for vector form PM me i can help you out.
