Possibly stupid question, but did you put the girl folder in the correct folder?
WhoreMaster\Resources\Characters
If the folder with the images aren't there, they won't show up. The way to make sure it's in the right folder is in the editor, when you enter the game of the folder, "Images Found" will show how many images are in the folder (well, only .jpg files, seems to not count .gif files). If it's 0 (and the folder isn't composed of all .gif files), then the editor cannot find any, which means that the folder is not in the correct place for it to find, which means the game itself cannot find them.