I am a hobby baker making my first baby shower cake in December, but I'm already planning. The cake topper is porcelain and is 4" in diameter (round). I planned to make an 8" bottom layer and a 6" top layer to put the topper on. Would 6" be too small for a 4" topper? Would that look strange? Should I make a 10" bottom layer and an 8" top? Any suggestions you have would be most welcome. I have learned so much on this site so far. THANKS!!!