Squeeble has a point, we have no idea what you're actualy after, tho I'll take a guess since I used to do Oblivion modding.
First, the obvious goal you want to acheive is to have the Head of an FF7 character on a playermodel in Oblivion, well the most standard Route is to Model and Rig one from scratch, however it doesn't look like you want to go this way but rather use a facegen program which seems to be largely automated (and also fairly dodgey IMO), however I've known people who tried this method and you really aren't going to get good front and side pics of any FF7 Characters, and the even taking pics of the model that appear in Kingdom hearts with a viewer isnt that great since they are rather simple models with a sort of cartoonish look to them so would look really off in a game like Oblivion.
So, I personaly recommend you draw up some front and side shots by hand and use those to Model the head yourself, sure it may take a little longer, but the result will be MUCH better then anything one of tho generating programs can do (Remember the quickest way isn't always the best, especialy when it comes to models)