Thanks, but this is actually REALLY outdated and doesn't actually look like a fox now that I look back on it o3o;;
Well the main difference between fox and wolf heads would be that a fox has a larger forehead. A fox also has a slightly narrower snout.
[link] <Look at that photo. It is quite hard to make them not look the same, but it's all just in practise. I could do another, slightly more anatomically correct tutorial, if you would like? It might be a while but I'll try get it done before Christmas?