My very first cake

This was made for my nephew for his 18th. He had bonfire party. So i made a
bonfire under the stairs.it was a choc fudge cake with buttercream filling
choc fondant.i have found a buttercream icing made with cream and people
seam to like it better. But i have found not many people like it because its
to sweet. So i.m looking for a good mock icing to use instead. Love to her
what you think. Oh everyone loved and enjoyed my cake so i was happy with
thus result.