I have just looked on the website for the spiderman bust cake and it looks amazing http://frostingfun.blogspot.co.uk/ I was wodering where I would purchase the styrafoam head from in the UK and also is it possible to do this with sugarpaste instead of covering with buttercream as we don't do crusting buttercream in the UK and am afraid it will be messy.
If you look in my gallery there is a spiderman cake done in fondant. I also did not want to use styrofoam so I used rice krispy treats for the head.
you can find online by searching for male styrofoam head with face but they are $15 & up. You can buy a womens head with face at your local beaty store, like sallys beauty for $4