Birthday Cake

So, my now 8 year old, requested a cheesecake for his birthday.
Doesn't sound too hard, I thought.
Then, he adds, "decorated like Leonardo the Teenage Mutant Ninja Turtle."
Great. No idea where to start.
First of all, you usually don't frost a cheesecake.
Secondly, I'm not an artist! (at all)

Here's what I came up with.
He was pretty happy with it, and that's all I cared about!

I mixed up the cheesecake batter and then mixed in some green food coloring.
After it cooled, I added the mask and smile.
Pretty easy. Not super professional looking, but it worked!