Think about it carefully Paul
At the moment the E & B fields are going into what would be the width and height the time field is what would be the Z movement so what is drawn is linear polarized. I guess what you could do to try and make it more generic to many cases by corkscrewing it but it still doesn't really work but that would at least cover angular momentum (
http://en.wikipedia.org/wiki/Angular_momentum_of_light)
The image sort of gives an impression of width to the light is the width of the E & B fields as well which is interesting. Google width or diameter of a photon and tell me how wide or what diameter a photon is and that is the problem with the above image
The real problem is this (
http://en.wikipedia.org/wiki/4-potential) which brings in time.
An electromagnetic four-potential is a relativistic vector function from which the electromagnetic field can be derived. It combines both an electric scalar potential and a magnetic vector potential into a single four-vector.
So the 3D representation above is probably about as good as you can get as a visual in our heads for a school level and I don't mind it but you need to remember it is a simplification. It is useful to bring in the concept of perpendicular E & B fields but it is still a long way from a realistic complex real world EM wave.
I am going to have a crack at drawing the above with phase and group velocities which I think I can squeeze into the 3D and that would probably take us to about a realistic light image we can draw if we ignore relativity.
