Here is my son's Birthday Cake. I can't seem to get the frosting smooth I guess I don't know how. At 6 years old he didn't really care. Here is a funny thing though...I used the wilton spray color and when I blew my nose a few hours later it came out the color I was spraying. Bright green........lol. 
I used the green spray before on a turtle cake and I had the same problem when I blew my nose! LOL! I love the look of the spray, however not to fond of the taste. so I try not to use it very often
Remind me not to read threads when I am eating LOL...
Cool cake by the way
So what is the trick to smoothing? It also kept pulling away from the crumb coat
Did you try the paper towel trick? If you have a crusting buttercream recipe, you can frost the cake, let it sit a few minutes, lay the paper towel over and with your hand or spatula, gently rub the towel to get a smooth affect. Otherwise, I have read on this site if you stick your tongue out and move it to the right or left while icing, it helps. 
kos
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