You're right Jack, no one has put together a character line up. Sorry about that, I had forgotten all about it until I read you're question. Ultimately it will be as simple as going into photoshop, lifting the 3/4 front drawings from the existing model sheets, putting them on one sheet, and scaling them accordingly. Perhaps we can get around to that tomorrow sometime.
For now the important thing to know is that ES comes up to just below Death's chest level. Frank and I did the model sheets for Death and ES apart, so we never set a standard head size. In fact, I think ES head would have to be smaller (or at least shorter because his chin sticks out horizontally). Death first of all is huge (he is bigger than any mortal) and second he has a very long head (vertically) meaning that his heads are worth more height on a model sheet chart than ES's are.
I hope that clears things up a bit. We will create a size comparison sheet as soon as possible which should further clarify the situation.
Also, remember: we can cheat the sizes a bit from time to time if it helps us tell the story, especially since everyone in the audience knows that Death is magical.